acceleration C2+ Topic:Space, Position & Direction US /ækˌsɛləˈreɪʃən/ UK /əkˌsɛləˈreɪʃən/ See IPA manual Meanings 1 noun the rate of increase of speed or, more generally, the act of speeding up The car's rapid acceleration pressed them back into their seats. Thesaurus Synonyms 1 noun · the rate of increase of... quickeningspeeduphasteningexpedition ↔ Opposites decelerationslowdownretardationbraking Word family Related forms accelerateacceleratoraccelerativecelerity Etymology AI details From Latin accelerātiō, from accelerāre ('to hasten'), from ad- ('to') + celer ('swift'). accelerāre Latin celer Middle English View etymology graph -> Topics Space, Position & Direction Word Formation & Derivatives External links Cambridge Dictionary Wiktionary Google Images # acceleration **Type:** Word **Level:** C2+ **Part of speech:** noun **IPA (US):** /ækˌsɛləˈreɪʃən/ **IPA (UK):** /əkˌsɛləˈreɪʃən/ ## Meanings 1. the rate of increase of speed or, more generally, the act of speeding up ## Examples - The car's rapid acceleration pressed them back into their seats. ## Synonyms - quickening - speedup - hastening - expedition ## Antonyms - deceleration - slowdown - retardation - braking ## Related Forms - accelerate - accelerator - accelerative - celerity ## Roots and Affixes - Root: accelerāre - Root: celer ## Etymology From Latin accelerātiō, from accelerāre ('to hasten'), from ad- ('to') + celer ('swift'). ## AI Etymology Acceleration is a noun meaning "the rate of increase of speed or, more generally, the act of speeding up". Historically, it is from Latin accelerātiō, from accelerāre ('to hasten'), from ad- ('to') + celer ('swift'). The visible construction is part of the etymology: acceleration is not just an unanalyzed simple word. The historical chain links Latin accelerāre with Latin celer. Close English family members include accelerate, accelerator, accelerative, and celerity. ## Topics - Space, Position & Direction - Word Formation & Derivatives markdown