- (n.) The doctrine that external bodies may be reduced to mind and ideas in a mind; any doctrine opposed to materialism or phenomenalism, especially a system that maintains the immateriality of the soul; idealism; especially, Bishop Berkeley's theory of idealism.
- (n.) The doctrine that immaterial substances or spiritual being exist or are possible.
Webster's Revised Unabridged Dictionary
| APA | Webster's. (2011). Immaterialism. Retrieved October 1, 2026, from http://smartdefine.org/immaterialism/definitions/2019202 |
| Chicago | Webster's. 2011. "Immaterialism" http://smartdefine.org/immaterialism/definitions/2019202 (accessed October 1, 2026). |
| Harvard | Webster's 2011, Immaterialism, Smart Define, viewed 1 October, 2026, <http://smartdefine.org/immaterialism/definitions/2019202>. |
| MLA | Webster's. "Immaterialism" 27 May 2011. Web. 1 October 2026. <http://smartdefine.org/immaterialism/definitions/2019202> |