/ Dictionary / Index C cardinal virtue: Meaning and Definition of Find definitions for: car'dinal vir'tue Pronunciation: [key] anything considered to be an important or characteristic virtue: Tenacity is his cardinal virtue. Ancient Philos. justice, prudence, temperance, and fortitude. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. cardinal trait cardinal vowel Related Content Daily Word Quiz: hale Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language