What does dualism mean?
Dualism is the principle or doctrine that some domain of reality consists of two fundamentally distinct and often opposed elements. Its most famous form is the mind–body dualism associated with René Descartes, which holds that mental phenomena are non-physical and irreducible to material processes. In religion, dualism describes worldviews — such as Zoroastrianism — that divide the cosmos between forces of good and evil locked in conflict. Beyond philosophy and theology, the word is used loosely to characterize any sharp twofold division, as in the dualism of nature and nurture or of self and society. Because it implies genuine separation rather than mere contrast, calling something a dualism can be a critical gesture, suggesting a binary that may be false or oversimplified. Related forms include "dualist," for an adherent of such a view, and "dualistic," describing systems built on twofold oppositions. The word remains central to debates about consciousness, ethics, and how we carve up the world into categories.
nounThe doctrine or state of being divided into two mutually exclusive or contrasting categories, especially the philosophical view that reality consists of two distinct principles, such as mind and body, or good and evil.
- The philosophical doctrine that reality or human nature consists of two distinct, independent substances or principles (e.g., mind and matter).
- The theological view that the world contains two opposing forces of comparable power, such as good and evil.
- Any twofold classification or division into two contrasting categories.
"Descartes's dualism holds that mind and matter are fundamentally different kinds of substance."
"The philosopher rejected physicalism in favor of a substance dualism that treats consciousness as non-material."
"The novel explores the moral dualism at the heart of human nature, pitting compassion against cruelty."
The plural is uncommon and used mainly in academic contexts when comparing multiple distinct dualist theories or frameworks, rather than referring to instances of a general concept.
"The seminar surveyed various dualisms across the history of philosophy, from Platonic to Cartesian accounts."
René Descartes argued that your body is a machine — but your mind is something else entirely. That one idea, Cartesian dualism, has divided philosophers for nearly four hundred years.
Reviewed by Deb Chak, Editor. AI-assisted content curated by RJS Tech Solutions LLP.
Etymology of dualism
The word "dualism" derives from the Latin "dualis," meaning "containing two" or "twofold," itself rooted in "duo," the Latin word for "two." It entered English in the late 18th century, primarily as a technical term in philosophy and theology to describe doctrines positing two fundamental principles. It shares this Latin root with "dual," "duality," and "dualist," and more distantly with "duel."
Related word forms
How dualism is actually used
"Dualism" belongs chiefly to academic registers — philosophy, theology, and critical theory — though it appears in general intellectual writing. In philosophy, "substance dualism" refers specifically to Descartes's position on mind and matter; in religious studies it often describes traditions like Zoroastrianism, which posit opposing cosmic forces. The term carries no strong emotional connotation, but it can imply an oversimplified binary when used critically, as in "the false dualism of nature versus culture."
Easily confused with dualism
'Dualism' usually denotes a strict two-part doctrine or opposition, while 'duality' is a more neutral term for anything having two aspects or natures.