[mod. f. Gr. ἀ priv. + κόσμ-ος world + -IST.] One who denies the existence of the universe or its distinctness from God.
1847. Lewes, Hist. Philos. (1852), III. 145. Spinoza did not deny the existence of God; he denied the existence of the world; he was consequently an Acosmist, not an Atheist.
