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deceleration has 2 distinct synonyms spread across 1 of its 3 senses. Each sense below keeps its own list, because a synonym belongs to a meaning and not to a word: swapping one sense's substitute into another sense's sentence is how a thesaurus makes writing worse. Its one recorded opposite is acceleration.
Counts are distinct word forms across every sense. A synonym that appears under three senses is counted once here and shown three times below, under each sense it belongs to.
a decrease in rate of change
“the deceleration of the arms race”
(physics) a rate of decrease in velocity
the act of decelerating; decreasing the speed
“he initiated deceleration by braking”
Synonyms, antonyms and the broader and narrower relations for deceleration come from Princeton University’s WordNet. Full sources and licences.