[ dee-sel-uh-reyt ]
/ diˈsɛl əˌreɪt /

verb (used with object), de·cel·er·at·ed, de·cel·er·at·ing.

to decrease the velocity of: He decelerates the bobsled when he nears a curve.
to slow the rate of increase of: efforts to decelerate inflation.

verb (used without object), de·cel·er·at·ed, de·cel·er·at·ing.

to slow down: The plane decelerated just before landing.


Origin of decelerate

First recorded in 1895–1900; de- + (ac)celerate

Related forms

de·cel·er·a·tion, nounde·cel·er·a·tor, nounnon·de·cel·er·a·tion, noun Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019

Examples from the Web for decelerate

British Dictionary definitions for decelerate


/ (diːˈsɛləˌreɪt) /


to slow down or cause to slow down

Derived Forms

deceleration, noundecelerator, noun

Word Origin for decelerate

C19: from de- + accelerate
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