Merriam-Webster's Collegiate® Dictionary, 11th Edition
PIGEON
I. noun
Etymology: Middle English, from Anglo-French pygoun, pijun, from Late Latin pipion-, pipio young bird, from Latin pipire to chirp
Date: 14th century
any of a widely distributed family (Columbidae, order Columbiformes) of birds with a stout body, rather short legs, and smooth and compact plumage, a young woman, an easy mark ; dupe , clay pigeon ,
II. noun
Etymology: alteration of pidgin
Date: 1826
an object of special concern ; accepted business or interest