Pronunciation: (ev"u-lOO'shun or, esp. Brit., ē"vu-), [key]
1. any process of formation or growth; development: the evolution of a language; the evolution of the airplane.
2. a product of such development; something evolved: The exploration of space is the evolution of decades of research.
3. Biol.change in the gene pool of a population from generation to generation by such processes as mutation, natural selection, and genetic drift.
4. a process of gradual, peaceful, progressive change or development, as in social or economic structure or institutions.
5. a motion incomplete in itself, but combining with coordinated motions to produce a single action, as in a machine.
6. a pattern formed by or as if by a series of movements: the evolutions of a figure skater.
7. an evolving or giving off of gas, heat, etc.
8. Math.the extraction of a root from a quantity. Cf. involution (def. 8).
9. a movement or one of a series of movements of troops, ships, etc., as for disposition in order of battle or in line on parade.
10. any similar movement, esp. in close order drill.
Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.