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auroral oval. auroral oval. An oval-shaped region centered on the earth's magnetic pole in which auroral emissions occur.
Oval - Projective geometry. 1  In the theory of projective planes, an oval is a set of n + 1 points in a projective plane of order n, with no three on a common line (no three points are collinear). 2  An ovoid in the finite projective geometry PG (3,q) is a set of q2 + 1 points such that no three points are collinear.