Identification, Friend or Foe: a system of transmitters and transponders that uses coded signals to distinguish between friendly and hostile aircraft.
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if and only if.
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Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
iff (ɪf)
logic a shortened form of if and only if: it indicates that the two sentences so connected are necessary and sufficient conditions for one another. Usually iff is used for equivalence in the metalanguage, rather than as the biconditional in the object language

abbreviation for
Identification, Friend or Foe: a system using radar transmissions to which equipment carried by friendly forces automatically responds with a precoded signal

Collins English Dictionary - Complete & Unabridged 10th Edition
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Computing Dictionary

IFF definition

1. Interchange File Format.
2. Identify friend or foe (radar).

iff definition

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.

The Free On-line Dictionary of Computing, © Denis Howe 2010 http://foldoc.org
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American Heritage
Abbreviations & Acronyms
if and only if
identification, friend or foe
The American Heritage® Abbreviations Dictionary, Third Edition
Copyright © 2005 by Houghton Mifflin Company.
Published by Houghton Mifflin Company. All rights reserved.
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Example sentences for IFF
A person is a bachelor iff that person is a marriageable man who has never married.
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