Real Dictionary

eagle
countable noun: An eagle is a large bird that lives by eating small animals.
countable noun: In golf, if you get an eagle, you get the golf ball into a hole in two strokes fewer than the number of strokes which has been set as the standard for a good player.

eagle in American English
any of a number of large, strong, flesh-eating accipitrine birds of prey noted for their sharp vision and powerful wings, as the bald eagle
to score an eagle on (a given hole)
noun: any of several large, soaring birds of prey belonging to the hawk family Accipitridae, noted for their size, strength, and powers of flight and vision: formerly widespread in North America, eagles are mostly confined to Alaska and a few isolated populatio

eagle in British English
noun: any of various birds of prey of the genera Aquila, Harpia, etc, having large broad wings and strong soaring flight: family Accipitridae (hawks, etc)
verb: to score two strokes under par for a hole