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  • in
    in
    preposition
    (used to indicate inclusion within space, a place, or limits).
  • In
    In
    indium.
  • IN
    IN
    abbreviation
    Indiana (approved especially for use with zip code).
  • in-
    in-
    a prefix representing English in (income; indwelling; inland , etc.), but used also as a verb-formative with transitive, intensive, or sometimes little apparent force (intrust; inweave , etc.). It often assumes the same forms as in-, such as en-, em-, im-.
  • -in
    -in
    a suffix, occurring in adjectives of Greek and Latin origin, meaning “pertaining to,” and (in nouns thence derived) also imitated in English (coffin; cousin , etc.).
  • in.
    in.
    abbreviation
    inch; inches.
Synonyms

in

1 American  
[in] / ɪn /

preposition

  1. (used to indicate inclusion within space, a place, or limits).

    walking in the park.

  2. (used to indicate inclusion within something abstract or immaterial).

    in politics; in the autumn.

  3. (used to indicate inclusion within or occurrence during a period or limit of time).

    in ancient times; a task done in ten minutes.

  4. (used to indicate limitation or qualification, as of situation, condition, relation, manner, action, etc.).

    to speak in a whisper; to be similar in appearance.

  5. (used to indicate means).

    sketched in ink; spoken in French.

  6. (used to indicate motion or direction from outside to a point within) into.

    Let's go in the house.

  7. (used to indicate transition from one state to another).

    to break in half.

  8. (used to indicate object or purpose).

    speaking in honor of the event.


adverb

  1. in or into some place, position, state, relation, etc..

    Please come in.

  2. on the inside; within.

  3. in one's house or office.

  4. in office or power.

  5. in possession or occupancy.

  6. having the turn to play, as in a game.

  7. Baseball. (of an infielder or outfielder) in a position closer to home plate than usual; short.

    The third baseman played in, expecting a bunt.

  8. on good terms; in favor.

    He's in with his boss, but he doubts it will last.

  9. Informal. in vogue; in style.

    He says straw hats will be in this year.

  10. in season.

    Watermelons will soon be in.

adjective

  1. located or situated within; inner; internal.

    the in part of a mechanism.

  2. Informal.

    1. in favor with stylish or trendy people; currently popular: the in thing to do.

      the in place to dine;

      the in thing to do.

    2. keeping up with the latest trends and fashions.

      the in clique at school.

  3. Informal. comprehensible only to a special or ultrasophisticated group.

    an in joke.

  4. well-liked; included in a favored group.

  5. inward; incoming; inbound.

    an in train.

  6. plentiful; available.

  7. being in power, authority, control, etc..

    a member of the in party.

  8. Golf. of or relating to the playing of the last nine holes of an eighteen-hole golf course (opposed to out).

    His in score on the second round was 34.

noun

ins plural
  1. Usually ins persons in office or political power (distinguished from outs).

  2. a member of the political party in power.

    The election made him an in.

  3. pull or influence; a social advantage or connection.

    He's got an in with the senator.

  4. (in tennis, squash, handball, etc.) a return or service that lands within the in-bounds limits of a court or section of a court (opposed to out).

verb (used with object)

British Dialect.
inned, inning
  1. to enclose.

idioms

  1. be in for, to be bound to undergo something, especially a disagreeable experience.

    We are in for a long speech.

  2. in for it, about to suffer chastisement or unpleasant consequences, especially of one's own actions or omissions: Also for it.

    I forgot our anniversary again, and I'll be in for it now.

  3. in with, on friendly terms with; familiar or associating with.

    They are in with all the important people.

  4. in that, because; inasmuch as.

    In that you won't have time for supper, let me give you something now.

In 2 American  
Symbol, Chemistry.
  1. indium.


IN 3 American  

abbreviation

  1. Indiana (approved especially for use with zip code).


in- 4 American  
  1. a prefix representing English in (income; indwelling; inland , etc.), but used also as a verb-formative with transitive, intensive, or sometimes little apparent force (intrust; inweave , etc.). It often assumes the same forms as in-, such as en-, em-, im-.


in- 5 American  
  1. a prefix of Latin origin meaning primarily “in,” but used also as a verb-formative with the same force as in- (incarcerate; incantation ).


in- 6 American  
  1. a prefix of Latin origin, corresponding to English un-, having a negative or privative force, freely used as an English formative, especially of adjectives and their derivatives and of nouns (inattention; indefensible; inexpensive; inorganic; invariable ). It assumes the same phonetic phases as in- (impartial; immeasurable; illiterate; irregular , etc.). In French, it became en- and thus occurs unfelt in such words as enemy (French ennemi, Latin inimicus, lit., not friendly).


-in 7 American  
  1. a suffix, occurring in adjectives of Greek and Latin origin, meaning “pertaining to,” and (in nouns thence derived) also imitated in English (coffin; cousin , etc.).


-in 8 American  
  1. a noun suffix used in a special manner in chemical and mineralogical nomenclature (glycerin; acetin , etc.). In spelling, usage wavers between -in and -ine. In chemistry a certain distinction of use is attempted, basic substances having the termination -ine rather than -in (aconitine; aniline , etc.), and -in being restricted to certain neutral compounds, glycerides, glucosides, and proteids (albumin; palmitin , etc.), but this distinction is not always observed.


-in 9 American  
  1. a suffixal use of the adverb in, extracted from sit-in, forming compound nouns, usually from verbs, referring to organized protests through or in support of the named activity (kneel-in; chain-in;be-in ) or, more generally, to any organized social or cultural activity (cook-in;sing-in ).


in. 10 American  

abbreviation

  1. inch; inches.


in 1 British  

abbreviation

  1. India

"Collins English Dictionary — Complete & Unabridged" 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012

in- 2 British  

prefix

  1. in; into; towards; within; on

    infiltrate

    immigrate

  2. having an intensive or causative function

    inflame

    imperil

"Collins English Dictionary — Complete & Unabridged" 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012

in. 3 British  

abbreviation

  1. inch(es)

"Collins English Dictionary — Complete & Unabridged" 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012

in 4 British  
/ ɪn /

preposition

  1. inside; within

    no smoking in the auditorium

  2. at a place where there is

    lying in the shade

    walking in the rain

  3. indicating a state, situation, or condition

    in a deep sleep

    standing in silence

  4. before or when (a period of time) has elapsed

    come back in one year

  5. using (a language, etc) as a means of communication

    written in code

  6. concerned or involved with, esp as an occupation

    in journalism

  7. expressing a ratio, proportion, or probability

    one in five boys

  8. while or by performing the action of; as a consequence of or by means of

    in crossing the street he was run over

  9. used to indicate goal or purpose

    in honour of the president

  10. (used of certain animals) about to give birth to; pregnant with (specified offspring)

    in foal

    in calf

  11. a variant of into

    she fell in the water

    he tore the paper in two

  12. (often foll by an infinitive) to have the ability (to do something)

  13. informal joining in; taking part

  14. (conjunction) because or to the extent that; inasmuch as

    I regret my remark in that it upset you

  15. no difference or interval between two things

"Collins English Dictionary — Complete & Unabridged" 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012

adverb

  1. in or into a particular place; inward or indoors

    come in

    bring him in

  2. so as to achieve office, power, or authority

    the Conservatives got in at the last election

  3. so as to enclose

    block in

    cover in a hole

  4. (in certain games) so as to take one's turn or one's team's turn at a certain aspect of the play; taking one's innings

    you have to get the other side out before you go in

  5. (of a fire) alight

    do you keep the fire in all night?

  6. (in combination) indicating an activity or gathering, esp one organized to protest against something

    teach-in

    work-in

  7. present at (the beginning, end, etc)

  8. between

  9. about to be affected by (something, esp something unpleasant)

    you're in for a shock

  10. acquainted with or sharing in

    I was in on all his plans

  11. associated with; friendly with; regarded highly by

  12. informal to wish or intend harm towards

"Collins English Dictionary — Complete & Unabridged" 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012

adjective

  1. (stressed) fashionable; modish

    the in thing to do

  2. competing

    you've got to be in to win

"Collins English Dictionary — Complete & Unabridged" 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012

noun

  1. intricacies or complications; details

    the ins and outs of a computer system

"Collins English Dictionary — Complete & Unabridged" 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012
in- 5 British  

prefix

  1. not; non- Compare un- 1

    incredible

    insincere

    illegal

    imperfect

    irregular

"Collins English Dictionary — Complete & Unabridged" 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012

-in 6 British  

suffix

  1. indicating a neutral organic compound, including proteins, glucosides, and glycerides

    insulin

    digitoxin

    tripalmitin

  2. indicating an enzyme in certain nonsystematic names

    pepsin

  3. indicating a pharmaceutical substance

    penicillin

    riboflavin

    aspirin

  4. indicating a chemical substance in certain nonsystematic names

    coumarin

"Collins English Dictionary — Complete & Unabridged" 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012

In 7 British  

symbol

  1. indium

"Collins English Dictionary — Complete & Unabridged" 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012

IN 8 British  

abbreviation

  1. Indiana

"Collins English Dictionary — Complete & Unabridged" 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012

in. Scientific  
  1. Abbreviation of inch


in More Idioms  
  1. In addition to the idioms beginning with in, also see under out of.


Synonym Usage

The prefixes in- and un- may both have, among other uses, a negative force. In- is the form derived from Latin, and is therefore used in learned words or in words derived from Latin or (rarely) Greek: inaccessible, inaccuracy, inadequate, etc. Un- is the native form going back to Old English, used in words of native origin, and sometimes used in combination with words of other origins if these words are in common use: unloving, ungodly, unfeeling, unnecessary, unsafe.

Other Word Forms

Noun Inflected Forms

Etymology

Origin of in1

First recorded before 900; 1925–30 in for def. 29; Middle English, Old English; cognate with German, Dutch, Old Frisian, Old Saxon, Gothic in, Old Norse ī, Latin in, Greek en, Lithuanian į

Origin of in-4

Middle English, Old English; see in

Origin of in-5

From Latin, combining form of in (preposition); cognate with in

Origin of in-6

< Latin; akin to an- 1, a- 6, un- 1

Origin of -in7

Middle English -in, -ine < Old French < Latin -inus, -ina, -inum < Greek -inos, -inē, -inon

Origin of -in8

< New Latin -ina. See -ine 2

Explanation

When one thing is in another, it is surrounded by or within it, the way chocolate chips are in a bowl of cookie batter. In is a word with many different uses. A child can be in a sandbox, and a teenager can be in love. You can sit in your car, or say to a friend, "See you in an hour!" An actor might be in a film, while your dad tells people he's in publishing, and both live in New York City. If your clothes are in, they're stylish, and if you're locked in your room, you're confined inside it.

Keep Reading on Vocabulary.com

Vocabulary lists containing in

Example Sentences

Examples are provided to illustrate real-world usage of words in context. Any opinions expressed do not reflect the views of Dictionary.com.

See Examples For:

“I’m able to take out a billion in real cost and reinvest it into innovation,” he added.

From MarketWatch Jul. 22, 2026

This analyst says a major inflection is in the cards.

From MarketWatch Jul. 22, 2026

Management’s outlook for third-quarter subscription revenue came in at $3.975 billion to $3.98 billion, though analysts tracked by FactSet were modeling $4.01 billion.

From MarketWatch Jul. 22, 2026

Investors perhaps feared a worse update to the outlook, and IBM shares were up 3% in the extended session following the latest update.

From MarketWatch Jul. 22, 2026

Doody spent four years in a tuberculosis sanatorium and refers to himself as a “lunger”—slang for someone who suffers from a disease of the lungs.

From "At Last She Stood" by Erin Entrada Kelly

In Johnson City, Tenn., financial adviser Sawyer Sams said he saved about $300 a month by refinancing a 30-year mortgage with a rate of 6.25% to an ARM with an initial rate of around 5.25%.

From MarketWatch Jul. 22, 2026

In the past week, special-operations forces have deployed to the region from their U.S. bases, according to flight-tracking data and U.S. officials.

From The Wall Street Journal Jul. 22, 2026

In addition to orchestrating different AI models, the AI Control Tower is now increasingly serving as a gateway to vet nonhuman identities.

From MarketWatch Jul. 22, 2026

In 2024, it rolled out “AI Overviews,” which provides a custom summary of search results.

From The Wall Street Journal Jul. 22, 2026

In the fireplace, a log breaks, sparks fly.

From "Will’s Race for Home" by Jewell Parker Rhodes

At a compact 45 minutes, “The Delta King’s Blues,” given its world premiere by IN Series here on Saturday, proved an efficient showcase for the talents of composer Damien Geter.

From The Wall Street Journal Dec. 9, 2025

We're talking about locking IN - the phrase you might have seen on social media or heard people saying lately.

From BBC Nov. 29, 2025

It also involved Teresa Femenía, a researcher at IN CSIC-UMH, who played a key role in developing the experimental work.

From Science Daily Nov. 8, 2025

IN 51 innings pitched, he’s struck out 55 batters with nine walks.

From Seattle Times May 22, 2024

IN THE MORNING, IN THE EVENING, AIN'T WE GOT FUN---- Outside the wind was loud and there was a faint flow of thunder along the Sound.

From " The Great Gatsby" by F. Scott Fitzgerald

Not that they''re a shoo in- there's a lot of resentment against Mr Sharif and his party, who are blamed for Pakistan's economic misery.

From BBC Feb. 1, 2024

Johanna Mayer: Yeah, he was 55, so they were sort of in- in their prime of their careers and their relationship.

From Scientific American Sep. 21, 2023

But Riley often takes mesh to another level by adding more in- or out-breaking routes at different depths.

From Los Angeles Times Aug. 28, 2022

Men stepped in- to windows, and women, listening.

From New York Times Sep. 26, 2021

This teacher, Maestra Eva, is a young, pretty woman with a bright red blouse and gold hoop earrings and short, clipped fingernails, which she doesn’t in- flict on any students.

From "The Queen of Water" by Laura Resau

"Little or no sustained growth can be expected until fiscal, debt, and -in some cases- inflation problems are addressed" by the three, the report concludes.

From Reuters Sep. 7, 2023

She went on to teach at Catholic schools in Chicago and southern California, where she also coached girls’ basketball, before she ended at Mundelein College - on the Chicago lakefront -in the 1960s.

From Washington Times Feb. 16, 2023

There will be a two-week winter break beginning on 22 December, during much of which players will be away from training -in contrast to England, where games are being played every few days.

From BBC Dec. 17, 2021

Corbyn, -in his speech, said the referendum held a deep symbolism for voters on both sides, which went far beyond a relationship with Europe.

From The Guardian Jan. 10, 2019

VISION, hereditary peculiarities of. -in amphibious animals. -varieties of. -affections of organs of, correlated with other peculiarities.

From The Variation of Animals and Plants under Domestication — Volume 2 by Darwin, Charles

“The way we’re approaching this is to first be extremely selective as to what kinds of businesses we’re investing in. And to recognize the probability of success is low,” he said.

From MarketWatch Jul. 14, 2026

When challenged on the fact this is trespassing, he said: "They're all wide open, so anybody can walk in. I think it's public land."

From BBC Jul. 11, 2026

"We shopkeepers are in a very difficult situation. Customers can no longer come in. We're forced to close for a week," he complained.

From Barron's Jul. 4, 2026

But “the most significant part of the volunteer departments is their working knowledge of the areas they live in. They know every corner. They know every face, every access point, every shortcut.”

From The Wall Street Journal Jul. 3, 2026

“Hop in. The distance is even shorter on wheels.”

From "Legendary Frybread Drive-In" by Cynthia Leitich Smith

I’ve also heard from various people telling me their whole financial picture, down to the pennies in their accounts, and the ins and outs of their divorces, estate fights and bad relationships with financial professionals.

From MarketWatch Jul. 22, 2026

Similar experimental systems have long been used to study how heat moves through slow moving materials, making them useful stand ins for the rocky interiors of planets.

From Science Daily Jul. 9, 2026

“If you don’t know the ins and outs and nuts and bolts inside City Hall, how are you going to be mayor?” he said.

From Los Angeles Times May 1, 2026

"I don't know the ins and outs of it, or how realistic it is, but it would mean a lot to me."

From BBC Apr. 18, 2026

“I’m in dry-goods business twenty years—fifteen on Grand Stritt and five on Graham Am-yer and never ins leben do I see a seven months so big.”

From "A Tree Grows in Brooklyn" by Betty Smith

They are likewise to carry home corn, which is not inned till August and September.

From A Journal of the Swedish Embassy in the Years 1653 and 1654, Vol II. by Morton, Charles

The last landed, inned, or stowed, of any sort of merchandise: so called by the water-side porters, carmen, &c.

From 1811 Dictionary of the Vulgar Tongue by Grose, Francis

In 1622 Sir Henry Appleton, the owner of the marsh, agreed to give one-third of it to Joas Croppenburg, a Dutchman skilled in the making of dikes, if he "inned" the marsh.

From The Naturalist on the Thames by Cornish, C. J. (Charles John)

His velocity steadily dropped, with his fastball averaging 94.7 mph in the first inning and 92.7 in the fifth.

From Los Angeles Times Jul. 21, 2026

Cole came back out for the seventh and walked Mookie Betts to lead off the inning.

From Los Angeles Times Jul. 18, 2026

The pitchers whom the Angels might well have taken in place of him, Kade Anderson and Seth Hernandez, each pitched a scoreless inning in the game.

From Los Angeles Times Jul. 12, 2026

Yamamoto’s uncharacteristic sixth inning ended his streak of quality starts at five, including two that lasted eight innings or more.

From Los Angeles Times Jul. 12, 2026

We didn’t get the call, but at least we were tied 1—1 at the end of the inning.

From "Life Is So Good" by George Dawson

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