decelerate C2+ Topic:Space, Position & Direction US /diˈsɛləˌreɪt/ UK /diːˈsɛləreɪt/ See IPA manual Meanings 1 verb to reduce speed; to slow down The train began to decelerate as it neared the station. Thesaurus Synonyms 1 verb · to reduce speed; to slow down slowbrakeretardslackenease off ↔ Opposites acceleratespeed upquickenhasten Word family Derived forms decelerationdecelerator Related forms acceleratecelerity Etymology AI details A modern coinage (late 19th century) from de- ('reverse, reduce') plus a base from accelerate, ultimately from Latin celer ('swift'), modeled on accelerate. de- Latin celer Middle English View etymology graph -> Topics Space, Position & Direction Word Formation & Derivatives External links Cambridge Dictionary Wiktionary Google Images # decelerate **Type:** Word **Level:** C2+ **Part of speech:** verb **IPA (US):** /diˈsɛləˌreɪt/ **IPA (UK):** /diːˈsɛləreɪt/ ## Meanings 1. to reduce speed; to slow down ## Examples - The train began to decelerate as it neared the station. ## Synonyms - slow - brake - retard - slacken - ease off ## Antonyms - accelerate - speed up - quicken - hasten ## Derived Forms - deceleration - decelerator ## Related Forms - accelerate - celerity ## Roots and Affixes - Root: de- - Root: celer ## Etymology A modern coinage (late 19th century) from de- ('reverse, reduce') plus a base from accelerate, ultimately from Latin celer ('swift'), modeled on accelerate. ## AI Etymology Decelerate is a modern coinage (late 19th century) from de- ('reverse, reduce') plus a base from accelerate, ultimately from Latin celer ('swift'), modeled on accelerate. Important recorded forms include de- (Latin) and celer (Latin). The current sense covers to reduce speed; to slow down. The wider family includes derived forms such as deceleration and decelerator and related words such as accelerate and celerity. ## Topics - Space, Position & Direction - Word Formation & Derivatives markdown