An instrument that measures the rate at which something is slowing down or decreasing in speed.
From Latin 'de-' (down, away) + 'celeritas' (speed) + Greek '-metron' (measure). The term was formed in the 19th century when scientists needed precise instruments to quantify deceleration in physics and engineering experiments.
While speedometers measure how fast you're going, decelerometers measure how quickly you're slowing down—this distinction became crucial in early automotive and aerospace engineering, especially for safety testing where stopping power mattered as much as acceleration.
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