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deceleration (n.)

1894, originally in railroading, coined from de- "do the opposite of" + (ac)celeration.

Verily "deceleration" is a word which could only be coined by the Great Western. ["Engineering," Feb. 2, 1894]

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Definitions of deceleration from WordNet

deceleration (n.)
a decrease in rate of change;
the deceleration of the arms race
Synonyms: slowing / retardation
deceleration (n.)
(physics) a rate of decrease in velocity;
deceleration (n.)
the act of decelerating; decreasing the speed;
he initiated deceleration by braking
From wordnet.princeton.edu