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mathematics (n.)

"the science of quantity; the abstract science which investigates the concepts of numerical and spatial relations," 1580s; see mathematic (the older form of the word in English, attested from late 14c.) + -ics. Originally from Aristotelian theory and denoting one of the three branches of philosophy; also "the quadrivium" and comprising arithmetic, geometry, astronomy, and music. It also could include optics.

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