English

Definition of iff conjunction from the Oxford Advanced Learner's Dictionary

 

iff

 conjunction
conjunction
BrE BrE//ɪf//
 
; NAmE NAmE//ɪf//
 
(mathematics)
 
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an expression used in mathematics to mean ‘if and only if’ Word Origin 1950s: arbitrary extension of if.
See the Oxford Advanced American Dictionary entry: iff