Nondualism (also non-duality) is a term and concept found in mysticism, metaphysics, psychology and philosophy. Within psychology and mysticism it refers to states of consciousness in which there is no distinction between the subject's sense of a self and the contents of the subject's awareness (the objects of consciousness). Within Yoga this is technically called absorption (dhyana). Nondualism also refers to a theological doctrine derived from the Upanisads which posits that the original essence of the human soul is indistinguishable from and thus identical with the Absolute or Godhead, Brahman. This is contrasted with the view that there is a perennial distinction between the soul and the divinity. Nondualism is sometimes conflated with Monism.
Read more about Nondualism: Etymology, Nondualism and Eastern Philosophy, Transpersonal Psychology, Nondualism Versus Monism, Nondualism Versus Solipsism, Metaphors For Nondualisms, Nondual Awareness, Challenges To Cartesian Dualism, Taoism