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.
any device used for the same purpose that operates by some other means, as by radio waves.
Contemporary Examples

Some trackers come with a built in altimeter to keep you honest on the number of stairs you take each day.
7 FitBit Hacks to Burn More Calories in 2014 Megan Humphreys January 5, 2014

A tracker with an altimeter will give you a far more accurate picture of calories-burned.
How to Find the Best Fitness Tracker for You Brent Rose November 19, 2013

Historical Examples

The altimeter on the instrument board in front of Flight Lieutenant Wiggins said twenty thousand feet.
Dave Dawson with the R.A.F R. Sidney Bowen

He corrected his course a little, glanced at the altimeter, and put his ship into a climb.
Final Weapon Everett B. Cole

The altimeter needle moved with sickening speed and already registered but little more than five hundred feet.
Creatures of Vibration Harl Vincent

Already it was very cold, though my altimeter only marked nine thousand.
Danger! and Other Stories Arthur Conan Doyle

I come out at ten thousand feet over the Mohave Desert, my altimeter still reading ten thousand feet.
Test Pilot David Goodger (

Dazed by the suddenness of the calamity, Carr turned to look at the altimeter.
Creatures of Vibration Harl Vincent

His altimeter showed that he was gradually losing elevation.
Astounding Stories, August, 1931 Various

When he checked the altimeter again, it registered just over 30,000 feet.
Warning from the Stars Ron Cocking

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.
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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