01 n. State of being dual or twofold; a twofold division; any system which is founded on a double principle, or a twofold distinction
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State of being dual or twofold; a twofold division; any system which is founded on a double principle, or a twofold distinction(Philos.)“An inevitable dualism bisects nature, so that each thing is a half, and suggests another thing to make it whole.” — Emerson.