Monad (from Greek μονάς monas, "unit" from μόνος monos, "alone"),[1] according to the Pythagoreans, was a term for Divinity or the first being, or the totality of all beings, Monad being the source or the One meaning without division.
For the Pythagoreans, the generation of number series was related to objects of geometry as well as cosmogony.[2] According to Diogenes Laertius, from the monad evolved the dyad; from it numbers; from numbers, points; then lines, two-dimensional entities, three-dimensional entities, bodies, culminating in the four elements earth, water, fire and air, from which the rest of our world is built up.[3][4]
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According to Hippolytus, this view was inspired by the Pythagoreans, who called the first thing that came into existence the "monad", which begat the dyad, which begat the numbers, which begat the point, begetting lines or finiteness, etc.[5] Pythagorean and Platonic philosophers like Plotinus and Porphyry condemned Gnosticism (see Neoplatonism and Gnosticism) for their treatment of the monad or one.
The term monad was later adopted from Greek philosophy by Giordano Bruno, Leibniz (Monadology), and others.