impetus — OET

impetus

noun

1 the flywheel lost all its impetus:

momentum, propulsion, impulsion, impelling force, motive force, driving force, drive, thrust, continuing motion;

energy, force, power, push, steam, strength.

2 new products were introduced to give the sales force fresh impetus:

motivation, stimulus, incitement, incentive, inducement, inspiration, encouragement, boost;

urging, pressing, goading, spurring, prodding;

informal a shot in the arm.

impetus Oxford Dictionary of English