vertex

noun

1. The highest point, top or apex of something.

   “The mountain’s vertex was covered in snow.”

   “He reached the vertex of his career after decades of work.”

2. The highest point, top or apex of something.
3. An angular point of a polygon, polyhedron or higher order polytope.
4. An angular point of a polygon, polyhedron or higher order polytope.
5. A point on the curve with a local minimum or maximum of curvature.
6. One of the elements of a graph joined or not by edges to other vertices.
7. A point in 3D space, usually given in terms of its Cartesian coordinates.
8. The point where the surface of a lens crosses the optical axis.
9. (particle)An interaction point.
10. The point where the prime vertical meets the ecliptic in the western hemisphere of a natal chart.
11. A sharp downward point opposite a crotch, as in the letters "V" and "W" but not "Y".