noun: (music) The solfeggio syllable used to indicate the sharp of the fourth note of a major scale.
noun: Short form of the female given name Fiona.
noun: (in combination) Abbreviation of fidelity. (e.g. in hi-fi or wi-fi) [Faithfulness to one's duties.]
noun: (in combination) Abbreviation of fiction. (e.g. in sci-fi) [(literature) Literary type using invented or imaginative writing, instead of real facts, usually written as prose.]
noun: Abbreviation of factor I. (clotting factor I)
noun: (law enforcement) Initialism of field interview/interrogation.
noun: (automotive) Initialism of fuel injection. [the delivery, under pressure, of a metered amount of fuel, as a fine spray, into the intake airflow or combustion chambers of an internal combustion engine]