# if and only if

> English word · Conjunction · IPA /ɪf ən(d)ˈəʊn.li ɪf/

## Definitions
1. Is equivalent to; implies and is implied by; is true and false in the same cases as.
2. Synonym of if (with added intensity)

## Source
Compiled from Wiktionary via kaikki.org (CC BY-SA). Data vintage: 2026-05-06.
Canonical page: https://plainspell.com/en/word/if-and-only-if