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var. of ad- before r: arrear.
var. of -al1, joined to words in which an l precedes the suffix: circular; lunar; singular.
[< Latin -āris; replacing Middle English -er < Anglo-French, Old French < Latin -āris]
var. of -er2, often under the influence of a spelling with -ar- in a cognate Latin noun: cellar; collar; poplar; scholar; vicar.
2. army regulation.
2. arrive; arrives.