The New International Encyclopædia/Principia

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Edition of 1905. See also Philosophiæ Naturalis Principia Mathematica on Wikipedia; and the disclaimer.

PRINCIP′IA (Lat., principles). A famous mathematical treatise in Latin, by Sir Isaac Newton (1687). It consists of three parts, two on the motions of bodies and one on the solar system, and contains the full development of Newton's great discovery, the principle of universal gravitation.