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auroral oval. auroral oval. An oval-shaped region centered on the earth's magnetic pole in which auroral emissions occur.
Noun. 1. oval-a closed plane curve resulting from the intersection of a circular cone and a plane cutting completely through it; the sums of the distances from the foci to any point on an ellipse is constant. ellipse. conic, conic section - (geometry) a curve generated by the intersection of a plane and a circular cone.