singularism; monadism
Philosophical term for the view that reality is composed of a single fundamental substance or principle. Rare outside academic contexts.
Singularism is a position that attempts to explain the origin of the world with a single principle.
monophyletism
Biological term for the theory that all organisms descended from a single ancestral form. Highly technical.
Monophyletism is the idea that living organisms evolved from a single ancestor.
Antonym meaning pluralism, the view that reality consists of multiple fundamental substances or principles.
Compound of 単 (single) + 元 (origin, element) + 論 (theory, argument). The exact historical derivation is uncertain; it appears to be a Meiji-era academic coinage for Western philosophical and biological concepts.