1 To cause to move faster; to quicken the motion of; to add to the speed of; — opposed to retard.
2 To quicken the natural or ordinary progression or process of; as, to accelerate the growth of a plant, the increase of wealth, etc.
3 To hasten, as the occurence of an event; as, to accelerate our departure. Accelerated motion (Mech.), motion with a continually increasing velocity.