/ Dictionary / Index Q quantum field theory: Meaning and Definition of Find definitions for: quan'tum field' the"ory Pronunciation: [key] — Physics. Physics. any theory in which fields are treated by the methods of quantum mechanics; each field can then be regarded as consisting of particles of a particular kind, which may be created and annihilated. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. quantum electrodynamics quantum jump 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