Definition of Decaf™ noun from the Oxford Advanced Learner's Dictionary

 

Decaf™

 noun
(also decaff)(both British English)(North American English decaf)noun
BrE BrE//ˈdiːkæf//
 
; NAmE NAmE//ˈdiːkæf//
 
[uncountable, countable](informal)
 
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decaffeinated coffee (British English) Regular coffee or Decaf? I'll have a decaff, please. Word Origin 1960s: abbreviation.
See the Oxford Advanced American Dictionary entry: Decaf™