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  1. Arabic.


Symbol, Chemistry.
  1. argon.


  1. annual return.
  2. Arkansas (approved especially for use with zip code).
  3. Army Regulation; Army Regulations.
  4. augmented reality.


  1. variant of ad- before r: arrear.


  1. variant of the adjective-forming suffix -al1, joined to words in which an l precedes the suffix: circular; lunar; singular.

Origin of -ar1

< Latin -āris; replacing Middle English -er < Anglo-French, Old French < Latin -āris


  1. variant of -er2, often under the influence of a spelling with -ar- in a cognate Latin noun: burglar; cellar; collar; mortar; poplar; scholar; vicar; vinegar.


  1. variant of -er1 on the model of -ar2, used in the formation of nouns of agency: liar; beggar.


  1. arrival.
  2. arrive; arrives.


  1. Arabic.
  2. Aramaic.


or a/r

  1. account receivable.
  2. accounts receivable.


  1. Insurance. all risks.


  1. annual return.
  2. Army Regulation; Army Regulations.
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018

Examples from the Web for ar

Contemporary Examples

Historical Examples

British Dictionary definitions for ar


the internet domain name for
  1. Argentina


the chemical symbol for
  1. argon


abbreviation for
  1. Arkansas
  2. Autonomous Region
  3. Also: A/R (in the US and Canada) accounts receivable


abbreviation for
  1. Arabia(n)
  2. Also: Ar Arabic


abbreviation for
  1. anno regni

Word Origin

Latin: in the year of the reign


suffix forming adjectives
  1. of; belonging to; likelinear; polar; minuscular

Word Origin

via Old French -er from Latin -āris, replacing -ālis (-al 1) after stems ending in l
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012

Word Origin and History for ar


word-formation element meaning "pertaining to, of the nature of," from Latin -arem, -aris "of the kind of, belonging to," a secondary form of -alis, dissimilated for used after syllables with an -l- (e.g. insularis for *insulalis, stellaris for *stellalis).

Online Etymology Dictionary, © 2010 Douglas Harper

ar in Medicine


  1. The symbol for the elementargon

ar in Science


  1. The symbol for argon.


  1. A colorless, odorless element in the noble gas group. Argon makes up about one percent of the atmosphere. It is used in electric light bulbs, fluorescent tubes, and radio vacuum tubes. Atomic number 18; atomic weight 39.948; melting point -189.2°C; boiling point -185.7°C. See Periodic Table.
The American Heritage® Science Dictionary Copyright © 2011. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.

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