/ Dictionary / Index E ecosystem: Meaning and Definition of Find definitions for: ec•o•sys•tem Pronunciation: (ek'ō-sis"tum, ē'kō-), [key] — n. Ecol. a system formed by the interaction of a community of organisms with their environment. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. See also: ecosystem (Thesaurus) écossaise ecotage Related Content Daily Word Quiz: careening Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language