Origin of Accelerate
First attested in the 1520s. Either from Latin accelerātus, perfect passive participle of accelerō (“I accelerate, hasten”), formed from ad + celerō (“I hasten”), which is from celer (“quick”) (see celerity), or Back-formation from acceleration..
Latin accelerāre accelerāt- ad- intensive pref. ad– celerāre to quicken (from celer swift)
From American Heritage Dictionary of the English Language, 5th Edition
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