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US /ˌsɛmiɪkˈstɪŋkʃən/ UK /ˌsɛmiɪkˈstɪŋkʃən/

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Etymology

A modern compound of the prefix 'semi-' ('half', from Latin 'semi-') + 'extinction' (from Latin 'extinctio(n-)', from 'extinguere', 'to put out').

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