/ Dictionary / Index F firstly: Meaning and Definition of Find definitions for: first•ly Pronunciation: (fûrst'lē), [key] — adv. in the first place; first. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. See also: firstly (Thesaurus) First Lord first mate 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