/ Dictionary / Index F field theory: Meaning and Definition of Find definitions for: field' the"ory Pronunciation: [key] — Physics. Physics. a detailed mathematical description of the distribution and movement of matter under the influence of one or more fields. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. field-test field trial Related Content Daily Word Quiz: penchant Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language