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n 1  :  a process of change in a certain direction <there has been much discussion as to … the possible of benign adenomas into invasive carcinoma -Jour. Amer. Med. Assoc.>   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 adv evo*lu*tion*ary adj 
Similar sounding terms:  evul·sion 

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