/ Dictionary / Index F fortnightly: Meaning and Definition of Find definitions for: fort•night•ly Pronunciation: (fôrt'nīt"lē), [key] — adj., adv., n., pl. -lies. —adj. occurring or appearing once a fortnight. —adv. once a fortnight. —n. a periodical issued every two weeks. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. See also: fortnightly (Thesaurus) fortnight Fort Orange Related Content Daily Word Quiz: eureka Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language