/ Dictionary / Index M motive power: Meaning and Definition of Find definitions for: mo'tive pow'er Pronunciation: [key] any power used to impart motion; any source of mechanical energy. locomotives or other vehicles that supply tractive power. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. motive motivity Related Content Daily Word Quiz: clairvoyant Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language