/ Dictionary / Index I imperial eagle: Meaning and Definition of Find definitions for: impe'rial ea'gle Pronunciation: [key] a brown eagle, Aquila heliaca, of Asia and southern Europe: the subspecies A. heliaca adalberti is endangered. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. Imperial bushel imperial gallon Related Content Daily Word Quiz: penchant Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language