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Materialism is the recognition of "objects in themselves", or outside the mind; ideas and sensations are copies of images of those objects.

"Materialism and Empirio-criticism: Critical Comments on a Reactionary Philosophy (1908)". Book by Vladimir Lenin. Introduction. Collected Works, Volume 14, www.marxists.org.
Materialism is the recognition of objects in themselves, or outside the mind; ideas and sensations are copies of images of those objects.