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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