if

conj. in the event that; whether; in the case of; would that; despite; on the condition that; provided that; when

n. possibility; supposition; condition

If, IF or I.F. may refer to:In linguisticsAn if-clause is the protasis of a conditional sentence.
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if.... is a 1968 cult film by British director Lindsay Anderson about an armed rebellion at a British public school. The film is associated with the 1960s counterculture movement; it was filmed at the time of the student uprisings in Paris in May 1968, and it includes controversial statements such as "There's no such thing as a wrong war. Violence and revolution are the only pure acts" and features surrealist sequences throughout. On its release in the UK it was given an X certificate.
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"If" is a poem by Rudyard Kipling. It was written in 1895; the poem was first published in the Brother Square Toes chapter of Rewards and Fairies, Kipling's 1910 collection of short stories and poems. Like William Ernest Henley's Invictus, it is a memorable evocation of Victorian stoicism and the "stiff upper lip" that popular culture has made into a traditional British virtue. Its status is confirmed both by the number of parodies it has inspired, and by the widespread popularity it still draws amongst Britons (it was voted Britain's favourite poem in a 1995 BBC opinion poll).
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n. yew, evergreen tree with poisonous needles; wood of yew tree; bow made of yew wood (Archaic)

(conj.)
Whether; -- in dependent questions.
  

(conj.)
In case that; granting, allowing, or supposing that; -- introducing a condition or supposition.
  

Abbreviation for intermediate frequency.

A frequency to which a carrier frequency is shifted as an intermediate step in transmission or reception. (188 )