verb (used with object), ac·cel·er·at·ed, ac·cel·er·at·ing.
  1. to cause faster or greater activity, development, progress, advancement, etc., in: to accelerate economic growth.
  2. to hasten the occurrence of: to accelerate the fall of a government.
  3. Mechanics. to change the velocity of (a body) or the rate of (motion); cause to undergo acceleration.
  4. to reduce the time required for (a course of study) by intensifying the work, eliminating detail, etc.
verb (used without object), ac·cel·er·at·ed, ac·cel·er·at·ing.
  1. to move or go faster; increase in speed.
  2. to progress or develop faster.

Origin of accelerate

1515–25; < Latin accelerātus speeded up (past participle of accelerāre), equivalent to ac- ac- + celer swift + -ātus -ate1
Related formsac·cel·er·a·ble, adjectiveac·cel·er·at·ed·ly, adverbo·ver·ac·cel·er·ate, verb, o·ver·ac·cel·er·at·ed, o·ver·ac·cel·er·at··ac·cel·er·ate, verb, re·ac·cel·er·at·ed, re·ac·cel·er·at·ing.self-ac·cel·erat·ing, adjectiveun·ac·cel·er·at·ed, adjective Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018

Examples from the Web for unaccelerated

Historical Examples of unaccelerated

British Dictionary definitions for unaccelerated


  1. to go, occur, or cause to go or occur more quickly; speed up
  2. (tr) to cause to happen sooner than expected
  3. (tr) to increase the velocity of (a body, reaction, etc); cause acceleration
Derived Formsaccelerable, adjectiveaccelerative or acceleratory, adjective

Word Origin for accelerate

C16: from Latin accelerātus, from accelerāre to go faster, from ad- (intensive) + celerāre to hasten, from celer swift
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012

Word Origin and History for unaccelerated



1520s, from Latin acceleratus, past participle of accelerare "to hasten, to quicken," from ad- "to" (see ad-) + celerare "hasten," from celer "swift" (see celerity). Related: Accelerated; accelerating.

Online Etymology Dictionary, © 2010 Douglas Harper