proliferation
n. uncountable C1 Advanced US //ˌpɹoʊɫɪfɝˈeɪʃən// UK //pɹəlˌɪfəɹˈeɪʃən// pro·lif·er·a·tion
n. a rapid increase in the number or amount of something. You use this word when something is spreading or growing very quickly.
n. a rapid and often excessive spread or increase in the number or amount of something. Frequently used in political, biological, or technological contexts.
The proliferation of smartphones has changed how we communicate.
The rapid proliferation of fake news on social media makes it difficult to find reliable information.
International treaties were designed to prevent the proliferation of nuclear weapons and ensure global security during the latter half of the twentieth century.
Borrowed from French prolifération.
Usage
Often followed by the preposition 'of' to specify what is increasing.