deceleration (n.)youdaoicibaDictYouDict[deceleration 词源字典]
1894, originally in railroading, coined from de- "do the opposite of" (see de-) + (ac)celeration.
Verily "deceleration" is a word which could only be coined by the Great Western. ["Engineering," Feb. 2, 1894]
[deceleration etymology, deceleration origin, 英语词源]