From WordNet (r) 3.0 (2006): decelerate v 1: lose velocity; move more slowly; "The car decelerated" [syn: decelerate, slow, slow down, slow up, retard] [ant: accelerate, quicken, speed, speed up] 2: reduce the speed of; "He slowed down the car" [syn: decelerate, slow down] [ant: accelerate, speed, speed up]
decelerate v 1: lose velocity; move more slowly; "The car decelerated" [syn: decelerate, slow, slow down, slow up, retard] [ant: accelerate, quicken, speed, speed up] 2: reduce the speed of; "He slowed down the car" [syn: decelerate, slow down] [ant: accelerate, speed, speed up]