## iff

<*mathematics, logic*>

if and only if, i.e. necessary and sufficient. For example, two figures are congruent iff one can be placed over the other so that they coincide.

Last updated: 2002-12-28

### Nearby terms:

IFC ♦ ifdef out ♦ IFDL ♦ IFF ♦ **iff** ♦ IFIP ♦ IFP ♦ IFS ♦ IFX ♦ If you want X, you know where to find it.

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