a. [See UNI- and PLANAR a.]
1. Geom. Having or characterized by coincident planes. Uniplanar node (or point), a form of node or conical point in which the tangent cone has become a pair of coincident planes; a unode.
1866. Brande & Cox, Dict. Sci., etc., II. 675. When this cone breaks up into two planes, the node is termed a biplanar node, and when these planes coincide, a uniplanar node.
1869. [see UNIPLANE].
1889. Cent. Dict., s.v. Dyadic, Uniplanar diadic, a planar diadic in which the plane of the antecedents coincides with that of the consequents.
2. Mech. Of motion: Lying or taking place in, confined to, one plane; of or pertaining to such motion.
1882. Minchin (title), Uniplanar Kinematics of Solids and Fluids. Ibid., 1. By uniplanar motion, or one-plane motion, is understood in the following pages motion which takes place in one plane or parallel to one plane.
