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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.
This is pretty much how a pedometer works. Photo: Pedometers can measure your steps because your body swings from side to side as you walk. Each swing counts as one step. Multiplying the number of swings by the average length of your steps tells you how far you've gone.