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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" (seead-) + celerare "hasten," from celer "swift," which is perhaps from PIE *keli- "speeding" (see celerity). 

Origin and meaning of acceleration

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