| Momentum 1. (n.) The quantity of motion in a moving body, mass times velocity; impetus. 2. (n.) Essential element, or constituent element. Thesaurus Entries clout, compulsion, drive, driving force, energy, force, impellent, impelling force, impetus, impulse, impulsion, incentive, incitement, inertia, irresistible force, moment, motive power, power, propulsion, push, strength, thrust |