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



(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 Origin1960s: abbreviation.
See the Oxford Advanced American Dictionary entry: Decaf™