Pronunciation: /ˈprɪmɪtɪvɪz(ə)m/
noun
[mass noun]-
1a belief in the value of what is simple and unsophisticated, expressed as a philosophy of life or through art or literature: the stark primitivism of the music
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2instinctive and unreasoning behaviour: a gradual emergence from primitivism to modern civilization

Derivatives
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noun & adjective