The definition of a pedal is something you push with your foot or legs that powers something or that prevents the dampers on a piano from stopping the sound.(noun)
Pedal is to use your foot or leg power to power something, or to press on something that provides power.(verb)
An example of pedal is wen you make a bicycle move forward with the power of your legs by pressing on pedals.
See pedal in Webster's New World College Dictionary
Origin: L pedalis < pes (gen. pedis), foot
Origin: MFr pédale < It pedale < L pedalis: see pedalthe
See pedal in American Heritage Dictionary 4
Origin: French pédale
Origin: , from Italian pedale
Origin: , from Latin pedālis, one foot long
Origin: , from pēs, ped-, foot; see ped- in Indo-European roots.
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