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Mon"ism (mn"z'm or m"nz'm), n. [From Gr. mo`nos single.] 1. (Metaph.)
That doctrine which refers all phenomena to a single ultimate
constituent or agent; -- the opposite of dualism.
The doctrine has been held in three generic forms: matter and its
phenomena have been explained as a modification of mind, involving an
idealistic monism; or mind has been explained by and resolved into
matter, giving a materialistic monism; or, thirdly, matter, mind, and
their phenomena have been held to be manifestations or modifications of
some one substance, like the substance of Spinoza, or a supposed
unknown something of some evolutionists, which is capable of an
objective and subjective aspect.