/ Dictionary / Index Q quantum state: Meaning and Definition of Find definitions for: quan'tum state' Pronunciation: [key] — Physics. Physics. the condition in which a physical system exists, usually described by a wave function or a set of quantum numbers. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. quantum optics quantum statistics Related Content Daily Word Quiz: lunar Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language