Look up if in Wiktionary, the free dictionary.

If, IF or I.F. may refer to:

In linguistics

• An if-clause is the protasis of a conditional sentence.

In science, mathematics and technology

• in mathematics if used as a Logical conditional
• "if statement", one form of conditional statement used very widely in computer programming languages
• IF, the Interrupt Flag in the x86 architecture.
• Impact Factor, a measure of the importance of scientific journals
• Initiation factor, an important component in protein synthesis
• Intelligent falling, alternative theory of gravitation
• Interactive fiction, text-based computer games featuring interactive stories and environments
• Intermediate frequency, an intermediate step in radio transmission or reception
• Intermediate filament, a component of the cytoskeleton
• Internal focusing, a lens technology in which focusing occurs only with internal elements.
• InvisionFree, an ISP which provides free hosted forums.
• Isolated Formesis, a thermodyamic theory relating calorimetry to the second law of thermodynamics.

In business

• If (insurance company), in the Nordic countries
• Intelligent Finance, a retail banking operation of the Halifax Bank of Scotland group
• Islas Airways IATA airline designator
• iF International Forum Design, a society best-known for its iF design awards

In music

• If (band), 1970s British progressive jazz-rock band
• If?, a dance band of the late 1980s and early '90s
• "If" (Bananarama song)
• "If" (Bread song)
• "If" (The Cult song)
• "If" a duet by Étienne Daho and Charlotte Gainsbourg
• "If" (Janet Jackson song)
• "If" (Pink Floyd song)
• "If" (Red Hot Chili Peppers song)
• "If (They Made Me a King)", a song originally written in 1934 and popularized in 1951 by Perry Como
• In Flames, a Melodic Death Metal Band from Sweden
• "If", song by Beyoncé Knowles

In other entertainment

• if...., a 1968 British film
• If... (comic), a political comic strip which appears in the UK newspaper The Guardian
• If... (TV series), a series of BBC drama-documentaries
• If—, Rudyard Kipling poem, If you can keep your head when all about you...
• If (magazine), subtitled "Worlds of Science Fiction", launched in 1952
• Interactive fiction, computer text adventure games
• The International Fleet, the fictional space defense force of Earth in the Orson Scott Card novel Ender's Game
• India Forums, an online internet discussion forum dedicated to Indian Television

Other

• If (island), a small island in the Bay of Marseille, France
  • Château d'If, a fortress prison on that island

See also

• If and only if, iff, indicating necessary and sufficient conditions
• IFF

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