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def.

See more synonyms for def. on Thesaurus.com
  1. defective.
  2. defendant.
  3. defense.
  4. deferred.
  5. defined.
  6. definite.
  7. definition.
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Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018
British Dictionary definitions for def.

def.

abbreviation for
  1. definition
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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