proliferation
US /prəˌlɪf.əˈreɪ.ʃən/
UK /prəˌlɪf.əˈreɪ.ʃən/
1.
rapid increase in the number or amount of something
:
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The proliferation of smartphones has changed communication.
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We need to control the proliferation of fake news.
rapid increase in the number or amount of something