/ Dictionary / Index I interior drainage: Meaning and Definition of Find definitions for: inte'rior drain'age Pronunciation: [key] — Physical Geog. Physical Geog. a drainage system whose waters do not continue to the ocean either on the surface or underground, but evaporate within the land area. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. interior designer interiorism Related Content Daily Word Quiz: spectral Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language