iff

¹ American  

Mathematics.

1. if and only if.

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IFF ² American  

Military.

1. 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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IFF ¹ British  

abbreviation

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

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iff ² British  

/ ɪf /

conjunction

1. 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

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Example Sentences

Saudi jets could be equipped with downgraded avionics, reduced flight performance or range, limited weapons packages, hidden IFF transmitters and so forth.

From The Wall Street Journal

However, when they checked the usual suspects, namely proteins from the highly conserved ALS and IFF/HYR families, they came up mostly short, except for one protein, IFF4109, with a partial affect.

From Science Daily

"There are a lot of open questions: the use of emergency law overriding the views of shareholders or the treatment of bond holders," said Stefan Legge, head of tax and trade policy at the University of St. Gallen's IFF Institute for Financial Studies.

From Reuters

A spokesperson at the European headquarters of IFF did not immediately respond to an emailed request for comment.

From Reuters

Symrise said on Wednesday it had a 12% share of the combined market for fragrances, flavours, aroma chemicals and cosmetic ingredients last year, with Givaudan, IFF and Firmenich accounting for 18%, 22% and 11%, respectively.

From Reuters