Akademik

af-
prefix assim. form of AD- before f.

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— see ad-

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var. of ad- before f: affect.

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af-,
prefix. the form of ad- (Cf.ad-) before f, as in affix.
a.f.,
audio frequency.
Af.,
1. Africa.
2. African.
AF (no periods),
1. Air Force, especially the United States Air Force.
2. Anglo-French.
3. audio frequency.
4. autofocus in a camera.

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prefix
1) variant spelling of ad-
2) assimilated before f (as in affiliate, affirm)

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af-, prefix
1. Assimilated form of L. ad- to, bef. initial f-, as in af-fectus, af-flātus, af-fluentia. Reduced in OFr. to a-, and so adopted in Eng. But artificially restored in Fr. spelling in 4–5, whence extended to Eng. in 5–6; as in affair, affiance, affront, early Eng. afaire, afiaunce, afront. In all mod. words from L., aff- has been written from the first, though only one f- is pronounced.
2. While the words from OFr. were being refashioned after L. spelling, af- was substituted for a- in various words where it did not represent L. af-, as in a(f)fray, a(f)fright; see ad- 2.

Useful english dictionary. 2012.