Everyone seems to have their own definition of Canned Hunts...
Dictionary.com
A hunt for animals that have been raised on game ranches until they are mature enough to be killed for trophy collections.
Wikipedia, the free encyclopedia
A canned hunt is essentially a trophy hunt in which the animal is kept in a more confined area, such as in a fenced-in area, increasing the likelihood of the hunter obtaining a kill. According to the dictionary definition a canned hunt is a "hunt for animals that have been raised on game ranches until they are mature enough to be killed for trophy collections.
About.com Animal Rights
In a canned hunt, a hunter pays a fee in exchange for the opportunity to kill an animal with little or no chance of escape. The animal may be confined by fences, tethered, or launched into the air as the hunter stands ready to kill the animal. Canned hunting sometimes involves "trophy" animals or exotic animals, and hunters are frequently offered a money back guarantee.
The American Society for the Prevention of Cruelty to Animals (ASPCA)
The canned hunt is a practice in which hunters pay fees to shoot and kill exotic animals in a confined area from which they are unable to escape.
The Humane Society of the United States
Canned hunting operations, also referred to as "shooting preserves" or "game ranches," are private trophy hunting facilities that offer their customers the opportunity to kill exotic and native animals that are trapped within enclosures.
People for the Ethical Treatment (PETA)
Most hunting occurs on private land, where laws that protect wildlife are often inapplicable or difficult to enforce. On private lands that are set up as for-profit hunting reserves or game ranches, hunters can pay to kill native and exotic species in “canned hunts.” These animals may be native to the area, raised elsewhere and brought in, or purchased from individuals who are trafficking in unwanted or surplus animals from zoos and circuses. They are hunted and killed for the sole purpose of providing hunters with a “trophy.” Animals on canned-hunting ranches are often accustomed to humans and are usually unable to escape from the enclosures that they are confined to, which range in size from just a few yards to thousands of acres. Most of these ranches operate on a “no kill, no pay” policy, so it is in owners’ best interests to ensure that clients get what they came for. Owners do this by offering guides who are familiar with animals’ locations and habits, permitting the use of dogs, and supplying “feeding stations” that lure unsuspecting animals to food while hunters lie in wait.