Medical Definition of evolution
1: a process of change in a certain direction <tumor evolution and progression—I. J. Fidler et al>
2a: the historical development of a biological group (as a race or species) : phylogenyb: a theory that the various types of animals and plants have their origin in other preexisting types and that the distinguishable differences are due to modifications in successive generations
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Dictionary: Definition of "evolution" Thesaurus: All synonyms and antonyms for "evolution" Spanish Central: Translation of "evolution" Nglish: Translation of "evolution" for Spanish speakers Britannica English: Translation of "evolution" for Arabic speakers Britannica.com: Encyclopedia article about "evolution"
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