Real Dictionary

falcon
countable noun: A falcon is a bird of prey that can be trained to hunt other birds and animals.

falcon in American English
any bird of prey trained to hunt and kill small game: in falconry the female is called a falcon, the male a tiercel
noun: any of several birds of prey of the family Falconidae, esp. of the genus Falco, usually distinguished by long, pointed wings, a hooked beak with a toothlike notch on each side of the upper bill, and swift, agile flight, typically diving to seize prey: som

falcon in British English
noun: any diurnal bird of prey of the family Falconidae, esp any of the genus Falco (gyrfalcon, peregrine falcon, etc), typically having pointed wings and a long tail