What is the definition of evolution?

Answer 1

-noun 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. Biology. 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. Mathematics. the extraction of a root from a quantity. 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.

Broad description - descent with modification

Narrow description - a change in the genetic composition of a population from generation to generation.
Evolution, in biology, is defined as the changes in the frequencies of inherited traits in population gene pools between generations. This definition encompasses within-species evolution as well as supra-species evolution, ie. the emergence of new major taxa from ancestral taxa.
the process by which different kinds of living organisms are thought to have developed and diversified from earlier forms during the history of the earth.