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On a plane, a lune is a shape with a convex edge and a concave edge, bounded by disks. Given two disks A and B, with intersection C, [A minus C] and [B minus C] would both be lunes. "Lune" has a related meaning on a sphere's surface, where it denotes the area bounded by two great circles. Thus, draw two great circles on a sphere; the area between them is a lune. The word "lune" comes from the Latin word for "moon," as the lune's shape resembles a crescent moon.

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Q: How is a lune defined in mathematics?
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