iff
About Our Definitions: All forms of a word (noun, verb, etc.) are now displayed on one page.
About Our Definitions: All forms of a word (noun, verb, etc.) are now displayed on one page.iff
conjunction \ˈif-ən(d)-ˈōn-lē-ˌif; ˈif, sometimes read with a prolonged f\Definition of IFF
: if and only if <two figures are congruent iff one can be placed over the other so that they coincide>
Origin of IFF
alteration of 1if
First Known Use: 1955
IFF
abbreviationDefinition of IFF
identification, friend or foe
Browse
Seen & Heard 
What made you want to look up iff? Please tell us where you read or heard it (including the quote, if possible).
