- annual return.
- (loosely) AR-15.
- Arkansas (approved especially for use with zip code).
- Army Regulation: This regulation supersedes AR 600-20, dated 6 November 2014.
- atmospheric river.
- augmented reality.
- variant of ad- before r: arrears.
- variant of the adjective-forming suffix -al1, joined to words in which an l precedes the suffix: circular; lunar; singular.
- 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.
- arrival.
- arrive; arrives.
- all risks.
- account receivable.
- accounts receivable.
- annual return.
- Army Regulation; Army Regulations.
- Argentina
- argon
- Arkansas
- Autonomous Region
- (in the US and Canada) accounts receivable
- of; belonging to; like
- anno regni
- Arabia(n)
- Arabic