pro·lif·er·ate 
/prəˈlɪfəˌreɪt/ verb
pro·lif·er·ates; pro·lif·er·at·ed; pro·lif·er·at·ing /prəˈlɪfəˌreɪt/ verb [no obj] : to increase in number or amount quickly
▪ New problems have proliferated in recent months. [=many new problems have occurred in recent months]
▪ New problems have proliferated in recent months. [=many new problems have occurred in recent months]
— pro·lif·er·a·tion /prəˌlɪfəˈreɪʃən/ noun
[noncount] ▪ cancer cell proliferation ▪ trying to halt (the) proliferation of nuclear weapons [singular] ▪ There has been a recent proliferation of medical advertising on TV.
/prəˌlɪfəˈreɪʃən/ noun [noncount] ▪ cancer cell proliferation ▪ trying to halt (the) proliferation of nuclear weapons [singular] ▪ There has been a recent proliferation of medical advertising on TV.
