Odometry is the use of data from motion sensors to estimate change in position over time. Odometry is used by some robots, whether they be legged or wheeled, to estimate (not determine) their position relative to a starting location. This method is sensitive to errors due to the integration of velocity measurements over time to give position estim...
• (n.) Measurement of distances by the odometer.
O·dom'e·try noun Measurement of distances by the odometer. 
odometry Measurement of distances with an odometer.