/ Dictionary / Index F fifthly: Meaning and Definition of Find definitions for: fifth•ly Pronunciation: (fifth'lē), [key] — adv. in the fifth place; fifth. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. See also: fifthly (Thesaurus) fifth force fifth monarchy Related Content Daily Word Quiz: modify Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language