vertex

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 surface on the skull; the crown of the head.
3. The common point of the two rays that form an angle.
4. The point at which an axis meets a curve or surface.
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.

Plural vertices