iff

2 definitions found

iff - Free On-line Dictionary of Computing (26 May 2007) :

  IFF
  
     1. <file format> Interchange File Format.
  
     2. Identify friend or foe (radar).
  

  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.
  
     (2002-12-28)