ar

plural ars

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

   All the ars in the inscription.

   2 more examples

   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

   RV [is spoken] as "ar-vee" instead of "I SPELL Romeo Victor".

   2016 CCEB, Communications Instructions Radiotelephone Procedures: ACP125 (G), p. 3-5

1. UKWest CountryWest MidlandsalternativeAlternative form of arr.

1. UKWest CountryWest MidlandsalternativeAlternative form of arr.

1. obsoleteObsolete spelling of are.

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

   1570, Roger Ascham, The Scholemaster

1. Hong KongManglishSinglishalternativeAlternative form of ah (question particle).

1. abbreviationinitialismnot comparablemathematicsInitialism of autoregressive.

plural ARs

1. countableengineeringAn 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. countableinformalengineeringAn assault rifle or automatic rifle.
3. abbreviationinitialismpluralplural onlyuncountableaccountingInitialism of accounts receivable.
4. abbreviationcountableinitialismuncountablepostalhobbiesInitialism of acknowledgment of receipt.
5. abbreviationcountableinitialismuncountableage regressionInitialism of age regression.
6. abbreviationinitialismuncountablecomputingInitialism of augmented reality.

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

   1 more example

   (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

   Synonyms: MR, mixed reality, spatial computing, CPS, w:cyber-physical system

7. abbreviationcountableinitialismslanguncountablelifestyleInitialism of alternate reality.
8. USabbreviationcountableinitialismhobbiesInitialism of American record, national record for the United States.
9. abbreviationcountableinitialismuncountableInitialism 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. abbreviationcountableinitialismuncountablebiochemistryInitialism of androgen receptor.
11. abbreviationcountableinitialismhobbiesInitialism of area record, best achievement among those by persons from a given continent.
12. abbreviationcountableinitialismuncountablecrimeInitialism of armed robbery.
13. abbreviationcountableinitialismuncountableemergency medicineInitialism of artificial respiration.
14. abbreviationcountableinitialismInitialism of aspect ratio.
15. abbreviationcountableinitialismuncountablegovernmentInitialism of assembly resolution.
16. abbreviationcountableinitialismuncountableclimatologyInitialism of atmospheric river.
17. abbreviationcountableinitialismuncountableaeronauticsInitialism of aerial refueling.

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

   Synonyms: Ark., Ark, ARK, ARK.

2. abbreviationAbbreviation of Arunachal Pradesh: a state of India.
3. abbreviationAbbreviation of American Revolution

   Synonyms: ARW, AWI

plural Ars

1. Alternative letter-case form of ar.