noun the position of planets when distant from each other five signs, or 150°.
2. quincunx ·noun a quincuncial arrangement, as of the parts of a flower in aestivation. ·see quincuncial, 2.
3. quincunx ·noun an arrangement of things by fives in a square or a rectangle, one being placed at each corner and one in the middle; especially, such an arrangement of trees repeated indefinitely, so as to form a regular group with rows running in various directions.