Usually means: Iff means "if and only if."
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We found 35 dictionaries that define the word iff:

General (14 matching dictionaries)
  1. IFF, iff: Merriam-Webster
  2. iff: Oxford Learner's Dictionaries
  3. IFF, iff: American Heritage Dictionary of the English Language
  4. iff: Collins English Dictionary
  5. Iff, iff: Wordnik
  6. IFF, iff: Wiktionary
  7. IFF: Webster's New World College Dictionary, 4th Ed.
  8. IFF: Infoplease Dictionary
  9. iff: Dictionary.com
  10. IFF (disambiguation), IFF (software), IFF, Iff: Wikipedia, the Free Encyclopedia
  11. IFF, iff: Stammtisch Beau Fleuve Acronyms
  12. IFF: TheFreeDictionary.com

Art (1 matching dictionary)
  1. Iff: Lexicon of Linguistics

Business (2 matching dictionaries)
  1. iff: Glossary of research economics
  2. Glossary of Trade and Shipping Terms (No longer online)

Computing (3 matching dictionaries)
  1. IFF, iff: Free On-line Dictionary of Computing
  2. BABEL: Computer Oriented Abbreviations and Acronyms (No longer online)
  3. IFF, Iff (disambiguation): Encyclopedia

Medicine (2 matching dictionaries)
  1. online medical dictionary (No longer online)
  2. online medical dictionary (No longer online)

Miscellaneous (4 matching dictionaries)
  1. IFF: Acronym Finder
  2. IFF: Three Letter Words with definitions
  3. AbbreviationZ (No longer online)
  4. iff: Wordcraft Dictionary

Science (4 matching dictionaries)
  1. Iff: Eric Weisstein's World of Mathematics
  2. iff: PlanetMath Encyclopedia
  3. FOLDOP - Free On Line Dictionary Of Philosophy (No longer online)
  4. A Glossary of Mathematical Terms (No longer online)

Slang (1 matching dictionary)
  1. Iff: Urban Dictionary

Sports (1 matching dictionary)
  1. IFF: Body Building

Tech (3 matching dictionaries)
  1. IFF: GEOGRAPHIC INFORMATION SYSTEMS, CARTOGRAPHY, AND REMOTE SENSING
  2. Glossary of Meteorology (No longer online)
  3. DOD Dictionary of Military Terms: Joint Acronyms and Abbreviations (No longer online)

Definitions from Wiktionary (
)
American English Definition British English Definition
noun:  Initialism of Interchange File Format, a file format standard developed for Amiga computers.
noun:  Initialism of identification friend or foe. [An identification system designed for command and control. It enables military and national (civilian air traffic control) interrogation systems to identify aircraft, vehicles or forces as friendly and to determine their bearing and their range from the interrogator.]

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