accelerometer

[ak-sel-uh-rom-i-ter]
noun
an instrument for measuring acceleration, as of aircraft or guided missiles.

Origin:
1900–05; acceler(ation) + -o- + -meter

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World English Dictionary
accelerometer (ækˌsɛləˈrɒmɪtə)
 
n
an instrument for measuring acceleration, esp of an aircraft or rocket

Collins English Dictionary - Complete & Unabridged 10th Edition
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Example sentences
He made himself a fine little floater-type accelerometer.
The gauntlet uses an accelerometer to respond to arm movements for the actual
  roll.
And the built-in accelerometer means the device automatically switches into
  portrait or landscape modes when rotated.
When an accelerometer in the mirror detects an impact, a call is automatically
  placed to the command center.
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