/ Dictionary / Index F FPO: Meaning and Definition of Find definitions for: FPO Pronunciation: [key] field post office. fleet post office. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. fpm fps Related Content Daily Word Quiz: lyceum Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language