/ Dictionary / Index F fi: Meaning and Definition of Find definitions for: fi Pronunciation: (fē), [key] — n. Music. the solmization syllable used for the semitone between the fourth and fifth degrees of a scale. F.I. Pronunciation: [key] Falkland Islands. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. FHWA FIA Related Content Daily Word Quiz: arboreal Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language