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evolution
1: a process of change in a certain direction <tumor evolution and progression — I. J. Fidler et al>2 a: the historical development of a biological group (as a race or species) : phylogeny b: 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
— evo·lu·tion·ari·ly \-shə-ˌner-ə-lē\
 adverb — evo·lu·tion·ary \-shə-ˌner-ē\
adjective
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