proper

American  

[prop-er] / ˈprɒp ər /

adjective

1. adapted or appropriate to the purpose or circumstances; fit; suitable.

   the proper time to plant strawberries.

   Synonyms:

   suited

2. conforming to established standards of behavior or manners; correct or decorous.

   a very proper young man.

   Synonyms:

   appropriate, becoming, befitting, meet

3. fitting; right.

   It was only proper to bring a gift.

   Synonyms:

   appropriate, becoming, befitting, meet

4. strictly belonging or applicable.

   the proper place for a stove.

5. belonging or pertaining exclusively or distinctly to a person, thing, or group.

   Synonyms:

   peculiar, individual, special

6. strict; accurate.

   proper pronunciation.

   Synonyms:

   true, just, exact, precise

7. in the strict sense of the word (usually used postpositively).

   Shellfish do not belong to the fishes proper. Is the school within Boston proper or in the suburbs?

8. Grammar.

   1. (of a name, noun, or adjective) designating a particular person or thing and written in English with an initial capital letter, as Joan, Chicago, Monday, American.

   2. having the force or function of a proper name.

      a proper adjective.

9. normal or regular.

10. belonging to oneself or itself; own.

11. Chiefly British Informal. complete or thorough.

    a proper thrashing.

12. Ecclesiastical. used only on a particular day or festival.

    the proper introit.

13. Heraldry. (of a device) depicted in its natural colors.

    an oak tree proper.

14. Informal.

    1. excellent; capital; fine.

    2. good-looking or handsome.

15. Mathematics. (of a subset of a set) not equal to the whole set.

16. Archaic. of good character; respectable.

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adverb

1. Informal. thoroughly; completely.

noun

1. Ecclesiastical. a special office or special parts of an office appointed for a particular day or time.

proper British  

/ ˈprɒpə /

adjective

1. (usually prenominal) appropriate or suited for some purpose

   in its proper place

2. correct in behaviour or conduct

3. excessively correct in conduct; vigorously moral

4. up to a required or regular standard

5. (immediately postpositive) (of an object, quality, etc) referred to or named specifically so as to exclude anything not directly connected with it

   his claim is connected with the deed proper

6. belonging to or characteristic of a person or thing

7. informal (prenominal) (intensifier)

   I felt a proper fool

8. (usually postpositive) (of heraldic colours) considered correct for the natural colour of the object or emblem depicted

   three martlets proper

9. maths logic (of a relation) distinguished from a weaker relation by excluding the case where the relata are identical. For example, every set is a subset of itself, but a proper subset must exclude at least one member of the containing set See also strict

10. archaic pleasant or good

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adverb

1. dialect (intensifier)

   he's proper stupid

2. informal thoroughly

   to get drunk good and proper

noun

1. the parts of the Mass that vary according to the particular day or feast on which the Mass is celebrated Compare ordinary

Usage

What is a basic definition of proper? Proper is an adjective that describes something that is appropriate, adheres to polite behavior, or is correct. Proper is also used in grammar to refer to nouns that identify specific people, places, or things. The word proper has additional senses as an adjective, adverb, and noun. Something is said to be proper if it is suitable or appropriate. For example, spring and summer are the proper seasons for growing plants because the weather is often warm and sunny, with frequent rain.

• Real-life examples: A parking lot is a proper place to leave your car. The South Pole is not the proper place to wear shorts. April Fool’s Day is a proper time to play jokes on people.
• Used in a sentence: She didn’t think the base of an active volcano was a proper spot for her summer home.

Proper also describes something that conforms to good manners or to behavior that is considered acceptable by a society. The words rude and impolite are opposites of this sense of proper.

• Real-life examples: It is not considered proper to laugh during a funeral. A bathing suit is not the proper outfit to wear to a banquet. It is not proper (or smart) to insult royalty.
• Used in a sentence: Fast food was not the proper meal to serve at the fancy dinner party.

Proper can also mean that something is correct or accurate.

• Real-life examples: Eating with your mouth is not the proper way to eat something (and often leads to food falling out of your mouth). Your English teacher will insist that you use proper spelling and punctuation in your writing. In the United States, the right lane of the road is the proper one to drive on.
• Used in a sentence: I can never remember the proper spelling of the word “definitely.”

In English grammar, the word proper is used to refer to nouns and other words that identify particular people, places, or things. Proper words are almost always capitalized in English. Nouns that are not proper nouns are called common nouns and refer to any of a class of entities rather than a specific one, such as cat, tree, or ocean.

• Real-life examples: Albert Einstein is the proper noun referring to a famous German physicist. New York City is the proper noun referring to a city in the United States. Portuguese is the proper adjective that describes someone or something from the country of Portugal.
• Used in a sentence: Some proper nouns, like “iPad,” don’t follow typical capitalization rules.

Other Word Forms

• properly
  adverb
• properness
  noun
• unproper
  adjective

Etymology

Origin of proper

First recorded in 1250–1300; Middle English propre, from Old French, from Latin proprius “one's own”

Explanation

Something proper is correct or right. There's a proper fork to use for salad, and a proper way to dress for a wedding. Things that are proper fit the situation — they're the right thing to do, because of custom or manners. A swear word is the opposite of proper language. Wearing a hat indoors isn't proper, as your grandparents have probably reminded you. Getting proper medical care means you've received the appropriate medical care. When things are proper, they're correct and suitable: they fit.

Example Sentences

The paper, titled "Quantum signatures of proper time in optical ion clocks," appeared April 20, 2026 in Physical Review Letters.

From Science Daily • May 18, 2026

This is something the general public should know so that the proper precautions are taken, and we can limit transmission and go about our business.

From The Wall Street Journal • May 16, 2026

But without the proper documentation or court-ordered child support, the Internal Revenue Service could characterize this money as a gift or settlement.

From MarketWatch • May 16, 2026

She also called on the Trust to give more answers to the teenage girl's family, and for staff to "face proper accountability".

From BBC • May 15, 2026

Alt-A was just what they called crappy mortgage loans for which they hadn’t even bothered to acquire the proper documents—to verify the borrower’s income, say.

From "The Big Short" by Michael Lewis

Related Words

• appropriate
• convenient
• decent
• fitting
• good
• legitimate
• useful