Real Dictionary

bicycle
countable noun: A bicycle is a vehicle with two wheels which you ride by sitting on it and pushing two pedals with your feet. You steer it by turning a bar that is connected to the front wheel.
verb: If you bicycle somewhere, you cycle there.

bicycle in American English
a vehicle consisting of a tubular metal frame mounted on two large, wire-spoked wheels, one behind the other, and equipped with handlebars, a saddlelike seat, and foot pedals
to carry on or as on a bicycle
to ride or travel on a bicycle
intransitive verb: to ride a bicycle
noun: a vehicle with two wheels in tandem, usually propelled by pedals connected to the rear wheel by a chain, and having handlebars for steering and a saddlelike seat
transitive verb: to ship or transport directly by bicycle or other means

bicycle in British English
noun: a vehicle with a tubular metal frame mounted on two spoked wheels, one behind the other. The rider sits on a saddle, propels the vehicle by means of pedals that drive the rear wheel through a chain, and steers with handlebars on the front wheel