monism

n. theory that reality consists of a single element; oneness of the universe (Philosophy); doctrine that only one supreme being exists (Theology)

Monism is the metaphysical and theological view that all is one, that there are no fundamental divisions, and a unified set of laws underlie nature.Monism is to be distinguished from dualism, which holds that ultimately there are two kinds of substance, and from pluralism, which holds that ultimately there are many kinds of substance. Monism is often erroneously seen in relation to pantheism, panentheism, and an immanent God. The concepts of absolutism, the monad, and the "Universal substrate" are closely related as well.
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Noun
1. the doctrine that reality consists of a single basic substance or element
(hypernym) doctrine, philosophy, philosophical system, school of thought, ism

(n.)
That doctrine which refers all phenomena to a single ultimate constituent or agent; -- the opposite of dualism.
  

(n.)
See Monogenesis, 1.
  

Monism A philosophy which derives all phenomena from a single origin: thus, making mind the result of matter; matter the result of mind; or again, mind and matter the result of some unitary essence prior to both. Far from being incompatible with dualism, monism is logically interdependent with it. Duality prevails everywhere, and everywhere dualities can be referred back to unities. The triad is the true number of manifestation and the key to the dispute between monists and dualists. See also DUALISM