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Definition fi

Etymology 1

Noun

fi

  1. (music) The solfeggio syllable used to indicate the sharp of the fourth note of a major scale.

Etymology 2

Abbreviation

Noun

fi (uncountable)

  1. (in combination) Abbreviation of fidelity. (e.g. in hi-fi or wi-fi)
  2. (in combination) Abbreviation of fiction. (e.g. in sci-fi)

Etymology 3

The word if spelled backwards, introduced in the ALGOL 68 Report (1968) as a terminator for an if clause.

Conjunction

fi

  1. (computer science) Reserved word, in some programming languagess, signaling the end of an "if" program instruction.

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