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— see ad-
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af-,
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.
* * *
prefix
1) variant spelling of ad-
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af-, prefix1. 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.
Useful english dictionary. 2012.