if and only if.
Identification, Friend or Foe: a system of transmitters and transponders that uses coded signals to distinguish between friendly and hostile aircraft.
(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
Identification, Friend or Foe: a system using radar transmissions to which equipment carried by friendly forces automatically responds with a precoded signal
1. Interchange File Format.
2. Identify friend or foe (radar).
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.
if and only if
identification, friend or foe
[if-uh n] /ˈɪf ən/ conjunction, Dialect. 1. .
International Foundation for Functional Gastrointestinal Disorders
[if-ee] /ˈɪf i/ adjective, iffier, iffiest. Informal. 1. full of unresolved points or questions: an iffy situation. 2. doubtful; questionable: An early decision on this is iffy. /ˈɪfɪ/ adjective iffier, iffiest 1. (informal) uncertain or subject to contingency: this scheme sounds a bit iffy adj. 1937, American English, from if + -y (2). Originally associated […]
International Federation of Fertility Societies