stare decisis n[New Latin, to stand by things that have been settled]
: the doctrine under which courts adhere to precedent on questions of law in order to insure certainty, consistency, and stability in the administration of justice with departure from precedent permitted for compelling reasons (as to prevent the perpetuation of injustice)
Source: Merriam-Webster's Dictionary of Law ©1996. Merriam-Webster, Incorporated. Published under license with Merriam-Webster, Incorporated.