hobby

American Heritage® Dictionary of the English Language, Fourth Edition

1. n. An activity or interest pursued outside one's regular occupation and engaged in primarily for pleasure.
2. n. Any of several small falcons of the genus Falco, formerly used for catching small birds or game.

Century Dictionary and Cyclopedia

1. n. A strong active horse of medium size having an ambling gait; a pacing horse; a nag; a garran.
2. n. Same as hobby-horse, 3.
3. n. Any favorite object, pursuit, or topic; that which a person persistently pursues or dwells upon with zeal or delight, as if riding a horse.
4. n. A small European falcon of the genus Falco and subgenus Hypotriorchis, H subbuteo. It is about 12 inches long, dark-brown above with the feathers edged with rufous, and white below with a rusty tinge and dark streaks. It is a true falcon, though undersized, and was formerly flown at small game, as larks. It is related to the merlin, F. æsalon, and to the American pigeon-hawk, II. columbarius; there are several varieties.
5. n. A goose.
6. n. A stupid fellow.

Wiktionary

1. n. Any of four species of small falcons in the genus Falco, especially Falco subbuteo.
2. n. An activity that one enjoys doing in one's spare time.
3. n. horses An extinct breed of horse native to the British Isles, also known as the Irish Hobby

GNU Webster's 1913

1. n. (Zoöl.) A small, strong-winged European falcon (Falco subbuteo), formerly trained for hawking.
2. n. A strong, active horse, of a middle size, said to have been originally from Ireland; an ambling nag.
3. n. A stick, often with the head or figure of a horse, on which boys make believe to ride.
4. n. A subject or plan upon which one is constantly setting off; a favorite and ever-recurring theme of discourse, thought, or effort; that which occupies one's attention unduly, or to the weariness of others; a ruling passion.

WordNet 3.0

1. n. an auxiliary activity
2. n. small Old World falcon formerly trained and flown at small birds
3. n. a child's plaything consisting of an imitation horse mounted on rockers; the child straddles it and pretends to ride