SAT IELTS principle Definition A fundamental truth, law, or rule that guides behavior or thought. Example "He refused the bribe on principle." Sign in to save SAT Quiz → IELTS Quiz → ← principal prior → Study tips featuring "principle" Let the Argument Reveal Unfamiliar Word Meanings Study the Exact Words Examiners Use Map the Author's Attitude Before Reading Questions Related words SAT antonym SAT abase SAT abdicate SAT abdomen SAT abduction SAT abet SAT abeyance SAT abject SAT abjure SAT ablution SAT abnegate SAT abnormal