/ Dictionary / Index U ultimacy: Meaning and Definition of Find definitions for: ul•ti•ma•cy Pronunciation: (ul'tu-mu-sē), [key] — pl. -cies. the state or quality of being ultimate. a basic or fundamental quality: to question the ultimacies of one's religious beliefs. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. See also: ultimacy (Thesaurus) ultima ultima ratio regum* Related Content Daily Word Quiz: ontiguous Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language