proliferation

noun
pro·​lif·​er·​a·​tion | \ prə-ˌlif-ə-ˈrā-shən How to pronounce proliferation (audio) \

Medical Definition of proliferation

1a : rapid and repeated production of new parts or of offspring (as in a mass of cells by a rapid succession of cell divisions)
b : a growth so formed
2 : the action, process, or result of increasing by or as if by proliferation

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