the world > animals > birds > order Falconiformes (falcons, etc.) > family Accipitridae (hawks, etc.) > [adjective] > of hawk > in full plumage (3)
Chiefly Falconry. Of a bird or its wings: having the feathers fully developed. Also (of a bird's feathers): fully developed.
Falconry. Of a hawk: having the feathers fully developed. Frequently (now only) with modifying adverb (see also full-summed, adj. 1). Now rare.