The act of accelerating, or the state of being accelerated; increase of motion or action; as opposed to retardation or deceleration.
The advancement of students at a rate that places them ahead of where they would be in the regular school curriculum.
The amount by which a speed or velocity increases (and so a scalar quantity or a vector quantity).
The change of velocity with respect to time (can include deceleration or changing direction).
The act of turning around, or doubling back.
A pleat or fold.
The process or an instance of making something double; a multiplication by two.