AR

AR

1. (international standards) ISO 3166-1 alpha-2 country code for Argentina.

   Synonym: ARG (alpha-3)

2. (alchemy, archaic) abbreviation of aqua regia

   Synonym: 🜆

3. (alchemy, archaic) abbreviation of la:balneum arenae (“sand bath”)
4. (alchemy, archaic) abbreviation of la:lapis armenus (“Armenian stone”)

AR (not comparable)

1. (statistics) Initialism of autoregressive.

AR (countable and uncountable, plural ARs)

1. (countable, 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.

   Coordinate term: AK

   • 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^[1]:

     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. (countable, weaponry, informal) An assault rifle or automatic rifle.
3. (uncountable or plural only, accounting) Initialism of accounts receivable.
4. (philately, postal) Initialism of acknowledgment of receipt.
6. (pornography) Initialism of age regression.

   Coordinate term: AP

7. (fandom slang) Initialism of alternate reality.
8. (countable, sports, US) Initialism of American record, national record for the United States.
9. Initialism of administrative rule or administrative regulation.
   • 1984 August 18, Karen J. Cox, “Women In Cages”, in Gay Community News, volume 12, number 6, page 7:

     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.

10. (biochemistry) Initialism of androgen receptor.
11. (sports, countable) Initialism of area record, best achievement among those by persons from a given continent.
12. (crime) Initialism of armed robbery.
13. (emergency medicine) Initialism of artificial respiration.
14. (countable) Initialism of aspect ratio.
15. (law, politics) Initialism of assembly resolution.

    Coordinate terms: AB, HB, HR, SB, SR

16. (meteorology) Initialism of atmospheric river.
17. (uncountable, computing) Initialism of augmented reality.

    Coordinate terms: RR, VR

    • 2020 December 22, Tyler Colp, “The Vtuber Industry: Corporatization, Labor, and Kawaii”, in Vice‎^[2], archived from the original on 22 December 2020:

      (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)

AR

1. Abbreviation of Arkansas: a state of the United States.

   Synonym: Ark.

2. Abbreviation of Arunachal Pradesh: a state of India.

• AR pupil

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AR

1. ISO 3166-2:CH code of Appenzell Ausserrhoden (canton)

AR ?

1. (Portugal) initialism of Assembleia da República (“Assembly of the Republic”)
   • 2022 February 6, Paulo Portas, “Chega quer vice-presidente na AR. Como está a extrema-direita nos outros países da UE?”, in CNN Portugal‎^[3]:

     Foi uma das primeiras polémicas a sair das eleições legislativas: o Chega quer um lugar na vice-presidência da Assembleia da República - ao qual tem, tradicionalmente, direito, por ter sido a terceira força política mais votada - mas a esquerda ameaça vetar a proposta. Em Global, Paulo Portas explicou o que se passa noutros países europeus.

     (please add an English translation of this quotation)

   • 2022 February 11, Lusa, “BE quer explicações na AR de entidades envolvidas no processo eleitoral da emigração”, in SAPO‎^[4]:

• “AR” in Dicionário infopédia da Língua Portuguesa.

AR

1. abbreviation of Arad: a county of Romania