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Definition of IFF
1. Initialism. Interchange File Format, a file format standard developed for Amiga computers. ¹
2. Initialism. identification friend or foe ¹
3. Abbreviation. (context: mathematics logic) if and only if; used to show that the predicate that follows it has the same truth value as the predicate that precedes it. ¹
¹ Source: wiktionary.com
Definition of IFF
1. if and only if [conj]