Definition of "finch"

Any Eurasian goldfinch (of species Carduelis carduelis, syn. Fringilla carduelis).  examples

Any bird of the family Fringillidae, seed-eating passerine birds, native chiefly to the Northern Hemisphere and usually having a conical beak.  examples

Any bird of other families of similar appearance to members of family Fringillidae.  examples

To hunt for finches, to go finching.  examples