One of the mysteries of the English language finally explained.
A revolution, a circuit; a thing with a circular nature.
Mid 17th century; earliest use found in James Ussher (1581–1656), Church of Ireland archbishop of Armagh and scholar. From ancient Greek περιτροπή turning round, revolution, in Hellenistic Greek also turning an opponent's arguments against himself or herself from περι- + τροπή.
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