1911 Encyclopædia Britannica, Volume 20… (1911)
“ The order of a plane curve is the number of points (real or imaginary) in which the curve is intersected by a straight line; it is equal to the degree (or coefficient of the highest power) of the Cartesian equation expressing the curve. The order of a non-plane curve is the number of points (real or imaginary) in which the curve intersects a plane (see Curve) . The order of a surface is the number of points in which the surface intersects a straight line. ”
