monism

noun

1. (countable, uncountable)The doctrine of the oneness and unity of reality, despite the appearance of diversity in the world.
2. (countable, historical, uncountable)The doctrine that there is a single source of political authority, especially that the church is subordinate to the state or vice versa.

   “The same conflict between the monism of temporal theorists and the dualism of ecclesiastical thinkers—the same opposition of organic to symbiotic union—occurred in the ninth century.”

3. (countable, uncountable)The legal doctrine that international law forms part of domestic law automatically after ratification or accession.