1.NounThe amount by which the sum of the interior angles of a triangle is less than 180° (π radians); the amount by which the sum of the internal angles of a polygon is less than what would be expected on the Euclidean plane.
2.NounThe amount by which the total of the angles around a vertex of a polyhedron is less than 360° (2π radians).
3.NounThe angular displacement of a tooth from vertical.