/ Dictionary / Index L law of thought: Meaning and Definition of Find definitions for: law' of thought' Pronunciation: [key] any of the three basic laws of traditional logic: the law of contradiction, the law of excluded middle, and the law of identity. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. law of thermodynamics law of trichotomy Related Content Daily Word Quiz: confectionery Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language