proliferation

noun
pro·​lif·​er·​a·​tion | \prə-ˌlif-ə-ˈrā-shən \

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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