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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.

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.

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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.

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IN ³ American  

abbreviation

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

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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-.

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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 ).

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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).

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-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.).

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-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.

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-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 ).

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in. ¹⁰ American  

abbreviation

1. inch; inches.

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in ¹ British  

abbreviation

1. India

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in- ² British  

prefix

1. in; into; towards; within; on

   infiltrate

   immigrate

2. having an intensive or causative function

   inflame

   imperil

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in. ³ British  

abbreviation

1. inch(es)

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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

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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

adjective

1. (stressed) fashionable; modish

   the in thing to do

2. competing

   you've got to be in to win

noun

1. intricacies or complications; details

   the ins and outs of a computer system

in- ⁵ British  

prefix

1. not; non- Compare un- 1

   incredible

   insincere

   illegal

   imperfect

   irregular

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-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

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In ⁷ British  

symbol

1. indium

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IN ⁸ British  

abbreviation

1. Indiana

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in. Scientific  

1. Abbreviation of inch

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in More Idioms  

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

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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

• ins
  plural

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.

Example Sentences

See Examples For:

in In IN in- -in in. ins inned inning

The filing cites items that were seized from her home in a federal investigation with no assurance that they will be returned, as well as unauthorized people who gained access to her Los Angeles residence.

From Los Angeles Times ● Oct. 9, 2026

The team on top of the mountain found Seibert’s name written in the trail register, proving he had reached the peak.

From Los Angeles Times ● Oct. 9, 2026

As long as his electrician and plumber can find the place, he figured, he’s in good shape.

From Los Angeles Times ● Oct. 9, 2026

Locals must now display address numbers visible from the street, at least 4 inches tall and 0.5 inches wide, and in a color that contrasts with their background.

From Los Angeles Times ● Oct. 9, 2026

She has retired from her most recent job as a bank secretary and has dedicated much of her time as a volunteer usher at the Kennedy Center for the Performing Arts in Washington, DC.

From "At Last She Stood" by Erin Entrada Kelly

In his post, he stated that the family was going through “profound shock and grief.”

From Los Angeles Times ● Oct. 9, 2026

In August, Leavitt announced her resignation, saying she wanted to focus on her family.

From Salon ● Oct. 9, 2026

In a nice moment of levity in another tense debate, comedian Joe Lycett reminded the traitors - and specifically Hesmondhalgh - that he would "like to be recruited at some stage".

From BBC ● Oct. 9, 2026

In Panama City, about 200 kilometers from the epicenter, there were scenes of panic as people rushed to evacuate from skyscrapers.

From Barron's ● Oct. 9, 2026

In 1862, Paul Broca found an area on the lower left frontal lobe that controlled the ability to speak.

From "Phineas Gage" by John Fleischman

His parents Yvonne and David Evans still live in the same "narrow" terrace house he grew up in IN Aberbargoed in the Rhymney Valley.

From BBC ● Oct. 9, 2026

I mention all those because, IN EACH, personnel who did not expect to be “at the tip of the spear” were, in fact, attacked, defended others and sometimes lost their lives.

From The Wall Street Journal ● Jul. 30, 2026

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 1962, THE Century 21 Exposition — Seattle’s second World’s Fair — became a big part of my daily life for six months.

From Seattle Times ● Feb. 2, 2024

“Yes, the MAP IN CHARLESTON,” Frank said loudly, giving Percy a wide-eyed look to make sure he hadn’t missed the information.

From "The Mark of Athena" by Rick Riordan

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

A global audience of 50 million was projected for the July 31 final when host England beat Germany 2-1, watching television in- and out-of-home plus on live streams.

From Seattle Times ● Aug. 31, 2022

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

"For this night ...” Haider trotted in- from the left. ". . . and all the nights to come,” finished Pyp.

From "A Game of Thrones" by George R.R. Martin

"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

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

It begins with a goal or objective -in this case, protecting the environment, or more specifically, drinking water.

From New York Times ● Dec. 22, 2017

MORREN, grafts of Abutilon. -on pelorism. -in Calceolaria. -non-coincidence of double flowers and variegated leaves.

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

“I’m just dipping my toe in.… It’s still an experiment for me,” he said.

From Los Angeles Times ● Oct. 7, 2026

"The team is together for longer, more training sessions, more meetings, more of the same language. You see improvements and automatisms clicking in. We made it a very good camp."

From BBC ● Oct. 5, 2026

"The water keeps coming in. It's hard to go out now. It's like at my waist level now," said Somkid Pheuk-ngam, 67, a vendor who lives near a canal just north of central Bangkok.

From Barron's ● Sep. 26, 2026

“We got a team together so we could ... block them in. It’s really the only way we could combat this problem.”

From Los Angeles Times ● Sep. 14, 2026

“Let me handle this. On TV, detectives and spies are always looking for people, getting in where folks don’t want them to get in. I’ve been studying their moves.”

From "The Smartest Kid in the Universe" by Chris Grabenstein

City had a large turnover of players with their ins and outs over the summer, but I'd expect them to be in the mix for all the trophies again this season.

From BBC ● Sep. 17, 2026

I got a crash course on Angeleno aesthetics and the ins and outs of the rough and tumble San Fernando Valley hurly-burly.

From Los Angeles Times ● Aug. 6, 2026

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

His ironies, and these ins and outs of a border-dispute with Orgoreyn, were of no interest to me.

From "The Left Hand of Darkness" by Ursula K. Le Guin

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 Francis Grose

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 Charles Morton

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 C. J. (Charles John) Cornish

He punctuated his performance with a fastball on the corner that ended the inning and wound up costing Atlanta its final ABS challenge.

From Los Angeles Times ● Oct. 8, 2026

Then Scott had the inning of his Dodgers career in the eighth — sitting down the Braves’ 3-4-5 hitters with a nasty array of sliders and fastballs.

From Los Angeles Times ● Oct. 8, 2026

Dodgers left fielder Teoscar Hernández had a scary moment in the sixth inning.

From Los Angeles Times ● Oct. 8, 2026

Ain’t that the truth; Freeman would’ve had two home runs Tuesday if Braves left fielder Mauricio Dubón hadn’t robbed him of one in the third inning with a sprinting, leaping catch at the wall.

From Los Angeles Times ● Oct. 7, 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