Definitions from Wiktionary (acceleration)

▸ noun:  (uncountable) The act of accelerating, or the state of being accelerated; increase of motion or action; as opposed to retardation or deceleration.
▸ noun:  (countable) The amount by which a speed or velocity increases (and so a scalar quantity or a vector quantity).
▸ noun:  (physics) The change of velocity with respect to time (can include deceleration or changing direction).
▸ noun:  The advancement of students at a rate that places them ahead of where they would be in the regular school curriculum.
▸ Also see acceleration

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