1. a sensitive aneroid barometer that is graduated and calibrated, used chiefly in aircraft for finding distance above sea level, terrain, or some other reference point by a comparison of air pressures.
  2. any device used for the same purpose that operates by some other means, as by radio waves.


  1. an instrument that indicates height above sea level, esp one based on an aneroid barometer and fitted to an aircraft

1918, from Modern Latin altimeter, from alti- “high” (from Latin altus; see old) + -meter.

  1. An instrument that measures and indicates the height above sea level at which an object, such as an airplane, is located.
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