01 n. A person with an unusual or odd personality; an eccentric person.
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1.
A person with an unusual or odd personality; an eccentric person.[informal]
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2.
Anything unusual in its class.“Pluto is an oddball among its eight sister planets. It's the smallest in both size and mass, and has the most elliptical orbit. It moves in a plane tilted markedly away from the other planets' orbits. Moreover, Pluto is the only planet made almost entirely of ice.” — Ron Cohen (Science News, Feb. 27, 1999, p. 139)