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Definition of 'pedometer'. pedometer. A pedometer is a device that measures the distance that someone has walked. ...a small pager with a built-in pedometer to count the number of steps its owner took. COBUILD Advanced English Dictionary.
Pedometers, step-counting devices used to measure physical activity, are not an accurate measure of exercise quality and should not be used as the sole measure of physical activity. Though exercise protects against heart disease, it is still possible for active adults to develop heart problems.