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substantialism

noun
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sub·​stan·​tial·​ism
plural -s

Definition of substantialism

: either of two doctrines in philosophy:
a : one holding that constant realities or substances underlie phenomena
b : one holding that matter is a real substance rather than an aggregation of centers of force

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“Substantialism.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/substantialism. Accessed 20 Apr. 2021.

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