Definition of assistant adjective from the Oxford Advanced Learner's Dictionary



BrE BrE//əˈsɪstənt//
; NAmE NAmE//əˈsɪstənt//
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 [only before noun] (abbreviation Asst) (often in titles) having a rank below that of a senior person and helping them in their work the assistant manager Assistant Chief Constable Owen Assistant Attorney General William Weld Word Originlate Middle English: from Old French, or from medieval Latin assistent- ‘taking one's stand beside’, from the verb assistere, from ad- ‘to, at’ + sistere ‘take one's stand’.
See the Oxford Advanced American Dictionary entry: assistant