Etymology
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acceleration (n.)

"act or condition of going faster," 1530s, from Latin accelerationem (nominative acceleratio) "a hastening," noun of action from past-participle stem of accelerare "to hasten, quicken," from ad "to" (see ad-) + celerare "hasten," from celer "swift," which is perhaps from PIE *keli- "speeding" (see celerity). 

Origin and meaning of acceleration

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Definitions of acceleration

acceleration (n.)
an increase in rate of change;
modern science caused an acceleration of cultural change
acceleration (n.)
the act of accelerating; increasing the speed;
Synonyms: quickening / speedup
acceleration (n.)
(physics) a rate of increase of velocity;
From wordnet.princeton.edu