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diagonalMain Entry: 1di·ag·o·nal Pronunciation: \dī-ˈa-gə-nəl, -ˈag-nəl\ Function: adjective Etymology: Latin diagonalis, from Greek diagōnios from angle to angle, from dia- + gōnia angle; akin to Greek gony knee — more at knee Date: 1563 1 a : joining two vertices of a rectilinear figure that are nonadjacent or two vertices of a polyhedral figure that are not in the same face b : passing through two nonadjacent edges of a polyhedron <a diagonal plane>
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