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:

IFCifdef outIFDLIFFiffIFIPIFPIFSIFXIf you want X, you know where to find it.

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