1) American lifestyle magazine 2) Cycling 3) Riding a bicycle 4) Tour de france activity 
[magazine] Bicycling is a cycling brand published by Rodale, Inc. in Emmaus, Pennsylvania. Bicycling claims to be the world’s largest cycling magazine. ==Origin== Bicycling started in 1961 as Northern California Cycling Association Newsletter, a 4 page mimeographed newsletter (8 ½ x 14) started by Peter Hoffman. It covered the local bicy...
• (n.) The use of a bicycle; the act or practice of riding a bicycle.
The use of a bicycle for transportation or recreation. It does not include the use of a bicycle in studying the body's response to physical exertion (bicycle ergometry test see exercise test). ... (12 Dec 1998) ... 
Bi'cy·cling noun The use of a bicycle; the act or practice of riding a bicycle. 
[n] - riding a bicycle
noun riding a bicycle