English

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Etymology 1

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From Old English āc (oak) (but not part of the etymology of acorn).

Prefix

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ac-

  1. (Can we verify(+) this sense?) (in place names) oak.
    • Acton

Etymology 2

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Assimilated form of ad- before c, k, q. Around 1500 the c was added to some versions of the a- prefix. From Middle English a-, from Old French a-, from Latin ad- (to, toward).

Pronunciation

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Prefix

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ac-

  1. To or with.
    ac- + ‎company → ‎accompany

Etymology 3

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Assimilated form of a-. Around 1500 the c was added to some versions of the a- prefix. From a- (on), from Old English ge-.

Pronunciation

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Prefix

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ac-

  1. On.
    ac- + ‎knowledge → ‎acknowledge

Anagrams

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Latin

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Prefix

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ac-

  1. alternative form of ad-
    Occurs when ad- is prefixed to a word beginning with the letter c or q (accēdō, acceptō, accessiō, acquiēscō, etc.)