proliferation

noun

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

1

a

: 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