hobby in WordNet English dictionary

1. an auxiliary activity
   avocation  by-line  hobby  pursuit  sideline  spare-time activity 
   
2. small Old World falcon formerly trained and flown at small birds
   hobby  Falco subbuteo 
   
3. a child's plaything consisting of an imitation horse mounted on rockers; the child straddles it and pretends to ride
   hobby  hobbyhorse  rocking horse