/ Dictionary / Index H Heisenberg uncertainty principle: Meaning and Definition of Find definitions for: Hei'senberg uncer'tainty prin"ciple Pronunciation: [key] — Physics. Physics. See Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. Heisenberg Heiss Related Content Daily Word Quiz: cygnet Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language