an instrument for measuring distance traveled, as by an automobile.

1785–95, Americanism; variant of hodometer < Greek hodó(s) way + -meter

odometrical [oh-duh-me-tri-kuhl] , adjective
odometry, noun
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World English Dictionary
odometer (ɒˈdɒmɪtə, əʊ-)
(US), (Canadian) Also called: mileometer a device that records the number of miles that a bicycle or motor vehicle has travelled
[C18 hodometer, from Greek hodos way + -meter]

Collins English Dictionary - Complete & Unabridged 10th Edition
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Word Origin & History

1791, from Fr. odomètre (1724), from Gk. hodos "way" (see cede) + metron "measure" (see meter (2)). First recorded in writings of Thomas Jefferson.
Online Etymology Dictionary, © 2010 Douglas Harper
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American Heritage
Science Dictionary
odometer   (ō-dŏm'ĭ-tər)  Pronunciation Key 
An instrument for indicating the distance traveled by a vehicle, typically by measuring the number of rotations of a wheel or fan whose rate of rotation depends on the speed of the vehicle. Compare speedometer.
The American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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Computing Dictionary

odometry definition

The use of motion sensors to determine a robot's change in position relative to some known position. For example, if a robot is traveling in a straight line and if it knows the diameter of its wheels, then by counting the number of wheel revolutions it can determine how far it has traveled. Robots will often have shaft encoders attached to their drive wheels which emit a fixed number of pulses per revolution. By counting these pulses, the processor can estimate the distance traveled.

The Free On-line Dictionary of Computing, © Denis Howe 2010 http://foldoc.org
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