Ar

//ˈɑː// adj, intj, name, noun, particle, verb, slang

adj, intj, name, noun, particle, verb, slang ·Common ·High school level

Definitions

Noun
  1. 1
    An AR-15 personal semi-automatic rifle, M-16 assault rifle, M-4 carbine, derivative or related gun; the Armalite AR family and derivatives. countable

    "In its August 2003 issue, while the ban was still in effect, Guns & Ammo ran a feature story titled “Stoner’s ‘Black Rifle’ Marches On,” subtitled “The basic AR platform has been refined, improved, upgraded, power-boosted and accurized.”"

  2. 2
    The name of the Latin script letter R/r.

    "All the ars in the inscription."

  3. 3
    Alternative letter-case form of ar. alt-of
  4. 4
    a unit of surface area equal to 100 square meters wordnet
  5. 5
    An assault rifle or automatic rifle. countable, informal
Show 16 more definitions
  1. 6
    a colorless and odorless inert gas; one of the six inert gases; comprises approximately 1% of the earth's atmosphere wordnet
  2. 7
    Initialism of accounts receivable. abbreviation, alt-of, initialism, plural, plural-only, uncountable
  3. 8
    Initialism of acknowledgment of receipt. abbreviation, alt-of, countable, initialism, uncountable
  4. 9
    Initialism of age regression. abbreviation, alt-of, countable, initialism, uncountable
  5. 10
    Initialism of augmented reality. abbreviation, alt-of, initialism, uncountable

    "Near-synonyms: MR, mixed reality, spatial computing, CPS, cyber-physical system"

  6. 11
    Initialism of alternate reality. abbreviation, alt-of, countable, initialism, slang, uncountable
  7. 12
    Initialism of American record, national record for the United States. US, abbreviation, alt-of, countable, initialism
  8. 13
    Initialism of administrative rule or administrative regulation. abbreviation, alt-of, countable, initialism, uncountable

    "As I was going over the AR book for my status change, I read several other ARs I believed the institution was violating so I decided to ask about them at the meeting."

  9. 14
    Initialism of androgen receptor. abbreviation, alt-of, countable, initialism, uncountable
  10. 15
    Initialism of area record, best achievement among those by persons from a given continent. abbreviation, alt-of, countable, initialism
  11. 16
    Initialism of armed robbery. abbreviation, alt-of, countable, initialism, uncountable
  12. 17
    Initialism of artificial respiration. abbreviation, alt-of, countable, initialism, uncountable
  13. 18
    Initialism of aspect ratio. abbreviation, alt-of, countable, initialism
  14. 19
    Initialism of assembly resolution. abbreviation, alt-of, countable, initialism, uncountable
  15. 20
    Initialism of atmospheric river. abbreviation, alt-of, countable, initialism, uncountable
  16. 21
    Initialism of aerial refueling. abbreviation, alt-of, countable, initialism, uncountable
Verb
  1. 1
    Obsolete spelling of are. alt-of, obsolete

    "But commonlie, the fairest bodies, ar bestowed on the foulest purposes."

Adjective
  1. 1
    Initialism of autoregressive. abbreviation, alt-of, initialism, not-comparable
Intj
  1. 1
    Alternative form of arr. UK, West-Country, West-Midlands, alt-of, alternative
Particle
  1. 1
    Alternative form of arr. UK, West-Country, West-Midlands, alt-of, alternative
  2. 2
    Alternative form of ah (question particle). Manglish, Singlish, alt-of, alternative
Proper Noun
  1. 1
    Abbreviation of Arkansas: a state of the United States. abbreviation, alt-of
  2. 2
    Abbreviation of Arunachal Pradesh: a state of India. abbreviation, alt-of
  3. 3
    Abbreviation of American Revolution abbreviation, alt-of

Antonyms

All antonyms

Example

More examples

"The planet Arèmo X3 is almost twice the size of planet Earth, and as you can see on the screen, quite similar to your world."

Etymology

Etymology 1

Abbreviation.

Etymology 2

From Middle English *ar, arres pl, from earlier *er.

Related phrases

Data sourced from Wiktionary, WordNet, CMU, and other open linguistic databases. Updated March 2026.