"What word is used in mathematics to mean ""if and only if""?"
Precisely when If and only if If, and only if Only if Just in case (catachresis) Iff Material equivalence ↔ If & only if ⇔ Bi-implication All and only Materially equivalent
↔ all and only bi implication if and only if only if precisely when just in case catachresis ⇔ materially equivalent material equivalence if only if iff
iff
WikipediaEntity
Iff