Wiktionary

1. fi(Noun)

   The solfeggio syllable used to indicate the sharp of the fourth note of a major scale.

2. fi(Noun)

   The end if program instruction, usually as shorthand.

3. Fi(ProperNoun)

   Short form of the female given name Fiona.

4. Fi(ProperNoun)

   fidelity, as in sound hi-fi

5. Fi(ProperNoun)

   abbr. for the Latin fidelis - as in Semper fi

6. Fi(ProperNoun)

   fiction