Cycling is a recreation and a sport and a means of transport across land.
As a sport it is governed internationally by the UCI, Union Cycliste Internationale, in Switzerland.
It involves riding bicycles, unicycles, tricycles, and possibly other things. See also HPVs (Human Powered Vehicles).
"Bicycling" redirects to "Cycling," yet there are subpages of bicycling that I just added links to now. --KQ