Abbreviation of factor I. (clotting factor I) / (law enforcement) Initialism of field interview/interrogation. / (automotive) Initialism of fuel injection.

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

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

(Jamaica) Alternative form of to

Short form of the female given name Fiona.

Third-person singular simple present indicative form of fy

(aviation) Abbreviation of flight information service.

(ski) International Ski Federation

simple past tense and past participle of fy

(networking, uncountable) Any of several standards for short-range wireless data transmission (IEEE 802.11). / (networking, uncountable) Wireless networking using one of these standards.