An instrument of observation, whose graduated limb consists of an entire circle. When fixed to a wall in an observatory, it is called a mural circle; when mounted with a telescope on an axis and in Y's, in the plane of the meridian, a meridian or transit circle; when involving the principle of reflection, like the sextant, a reflecting circle; and when that of repeating an angle several times continuously along the graduated limb, a repeating circle.
A series ending where it begins, and repeating itself.
A form of argument in which two or more unproved statements are used to prove each other; inconclusive reasoning.
From Middle English circle, cercle, from Old French cercle and Latin circulus, diminutive of Latin circus, from Ancient Greek κίρκος, related to Old English hring. Compare also Old English ċircul, which came from the same Latin source.
Modern English dictionary
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