/ Dictionary / Index D definitive plumage: Meaning and Definition of Find definitions for: defin'itive plum'age Pronunciation: [key] — Ornith. Ornith. the plumage of a bird that, once attained, does not change significantly in color or pattern for the rest of the bird's life. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. definitive host definitize Related Content Daily Word Quiz: digression Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language