Meaning of coevolution

co•ev•o•lu•tion

Pronunciation: (kō"ev-u-l'shun or, esp. Brit., -ē-vu-), [key]
— n.
  1. evolution involving a series of reciprocal changes in two or more noninterbreeding populations that have a close ecological relationship and act as agents of natural selection for each other, as the succession of adaptations of a predator for pursuing and of its prey for fleeing or evading.
Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.