- if and only if
- used to introduce a condition which is necessary as well as sufficient.→ if
English new terms dictionary. 2014.
if and only if
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If and only if — Iff redirects here. For other uses, see IFF (disambiguation). ↔ ⇔ ≡ Logical symbols representing iff. In logic and related fields such as mathematics and philosophy, if and only if (shortened iff) is a biconditional logical connective between… … Wikipedia
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