A person who believes in or advocates for acosmism; a philosopher who denies independent reality to the material world.
From acosmism plus the agent suffix -ist. Created in philosophical discourse to identify proponents of non-dualist or idealist metaphysics.
Medieval theologians were sometimes called acosmists because their beliefs suggested only God was truly real—everything else was just divine thought, which is why some philosophers called them too mystical to be rational.
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