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ar

noun — 18 senses

AR

nounalso spelled AR

Etymology Abbreviation.

17 senses
  1. 1An AR-15 personal semi-automatic rifle, M-16 assault…
  2. 2An assault rifle or automatic rifle.
  3. 3Initialism of accounts receivable.
  4. 4Initialism of acknowledgment of receipt.
  5. 5Initialism of age regression.
  6. 6Initialism of augmented reality.
  7. 7Initialism of alternate reality.
  8. 8Initialism of American record, national record for the…
  9. 9Initialism of administrative rule or administrative regulation.
  10. 10Initialism of androgen receptor.
  11. 11Initialism of area record, best achievement among those…
  12. 12Initialism of armed robbery.
  13. 13Initialism of artificial respiration.
  14. 14Initialism of aspect ratio.
  15. 15Initialism of assembly resolution.
  16. 16Initialism of atmospheric river.
  17. 17Initialism of aerial refueling.
1

Engineering, Government, Military, Natural sciences, Physical sciences, Politics, Tools, War, Weaponry An AR-15 personal semi-automatic rifle, M-16 assault rifle, M-4 carbine, derivative or related gun; the Armalite AR family and derivatives.

  • 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.”2017 December 14, David Heath, Elise Hansen and AJ Willingham, CNN Design: Joyce Tseng, “How an ‘ugly,’ unwanted weapon became the most popular rifle in America”, in CNN:
2

Engineering, Government, Military, Natural sciences, Physical sciences, Politics, Tools, War, Weaponry Informal An assault rifle or automatic rifle.

3

Accounting, Business, Finance Abbreviation, Initialism Initialism of accounts receivable.

4

Hobbies, Lifestyle, Philately Abbreviation, Initialism Initialism of acknowledgment of receipt.

5

Abbreviation, Initialism Initialism of age regression.

6

Computing, Engineering, Mathematics, Natural sciences, Physical sciences, Sciences Abbreviation, Initialism Initialism of augmented reality.

  • Near-synonyms: MR, mixed reality, spatial computing, CPS, cyber-physical system
  • (Cover started out as a company in the AR and VR business, but moved into the virtual talent sector; Ichikara is a startup designed to support their virtual talent)2020 December 22, Tyler Colp, “The Vtuber Industry: Corporatization, Labor, and Kawaii”, in Vice, archived from the original on 22 Dec 2020:
7

Lifestyle Abbreviation, Initialism, Slang Initialism of alternate reality.

8

Hobbies, Lifestyle, Sports US, Abbreviation, Initialism Initialism of American record, national record for the United States.

9

Abbreviation, Initialism Initialism of administrative rule or administrative regulation.

  • 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.1984 August 18, Karen J. Cox, “Women In Cages”, in Gay Community News, volume 12, number 6, page 7:
10

Biochemistry, Biology, Chemistry, Microbiology, Natural sciences, Physical sciences Abbreviation, Initialism Initialism of androgen receptor.

11

Hobbies, Lifestyle, Sports Abbreviation, Initialism Initialism of area record, best achievement among those by persons from a given continent.

12

Abbreviation, Initialism Initialism of armed robbery.

13

Emergency medicine, Medicine, Sciences Abbreviation, Initialism Initialism of artificial respiration.

14

Abbreviation, Initialism Initialism of aspect ratio.

15

Government, Law, Politics Abbreviation, Initialism Initialism of assembly resolution.

16

Climatology, Meteorology, Natural sciences Abbreviation, Initialism Initialism of atmospheric river.

17

Aeronautics, Aerospace, Aviation, Business, Engineering, Natural sciences, Physical sciences Abbreviation, Initialism Initialism of aerial refueling.

ar

noun

UK /ˈɑː/ · US /ˈɑɹ/

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

1

The name of the Latin script letter R/r.

  • All the ars in the inscription.
  • I have drunk en-ee-cee-tee-ay-ar from the ef-ell-oh-doubleyou-ee-ar-ess in his gee-ay-ar-dee-ee-en many a time.2004, Will Rogers, The Stonking Steps, page 170:
1 more example
  • RV [is spoken] as "ar-vee" instead of "I SPELL Romeo Victor".2016 CCEB, Communications Instructions Radiotelephone Procedures: ACP125 (G), p. 3-5
Derived terms
ar-dropping, arless, Jay Ar

Entry derived from the Wiktionary, under licence CC BY-SA 4.0 — authors: page histories for AR and ar.