(mathematics, logic) If and only if; used to show that the truth values of two statements are the same. / biconditionally / just in case or just in the case that / equal / that is to say / XNOR

Initialism of Interchange File Format, a file format standard developed for Amiga computers.

Initialism of identification friend or foe.

(slang) Of dubious authenticity, legitimacy or legality. / Uncertain or chancy.

The state or quality of being iffy.

comparative form of iffy: more iffy

superlative form of iffy: most iffy

Nonstandard form of if.

(informal) In an iffy manner.

present participle of what-if