Dictionary.com
definitions

a.f.

  1. audio frequency.

A.F.

  1. Air Force.
  2. Anglo-French.
  3. audio frequency.
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018
British Dictionary definitions for a.f.

a.f.

abbreviation for
  1. audio frequency
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012