/ Dictionary / Index N nonrelativistic quantum mechanics: Meaning and Definition of Find definitions for: non'rel•a•tiv•is'tic quan'tum mechan'ics Pronunciation: (non'rel-u-ti-vis'tik, non"-), [key] — Physics. Physics. a form of quantum mechanics that excludes relativistic effects and is approximately applicable to low-energy problems, as the structure of atoms and molecules. Cf. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. nonregent non rep. Related Content Daily Word Quiz: verbose Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language