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Eccentricity (behavior)

Unusual or odd behavior on the part of an individual

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Etymology

From Medieval Latin eccentricus, derived from Greek ekkentros, "out of the center", from ek-, ex- "out of" + kentron, "center". Eccentric first appeared in English essays as a neologism in 1551, as an astronomical term meaning "a circle in which the earth, sun, etc. deviates from its center" . Five years later, in 1556, the adjectival form of the word was used. In 1685, the definition evolved from the literal to the figurative, and eccentric is noted to have begun being used to describe unconventional or odd behavior. A noun form of the word‍— a person who possesses and exhibits these unconventional or odd qualities and behaviors‍— appeared by 1832.

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