/ Dictionary / Index T Third Commandment: Meaning and Definition of Find definitions for: Third' Command'ment Pronunciation: [key] “Thou shalt not take the name of the Lord thy God in vain”: third of the Ten Commandments. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. third class third degree Related Content Daily Word Quiz: winsome Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language