Third-person singular present tense of decelerate; slows down or reduces in speed.
Conjugated form of decelerate, from de- (reverse) plus accelerate (Latin accelerare, to quicken). The -ates ending marks third-person singular present tense.
In physics and engineering, 'decelerates' is the precise, scientific term for what we'd call 'braking' or 'slowing down'—it's the opposite of acceleration in motion.
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