Definition:Vertex


 * Graph Theory:
 * Vertex of Graph: The vertices of a graph are the points, which may or may not be joined by edges.


 * Geometry:
 * Vertex of Polygon: The corners of a polygon are known as its vertices.
 * Vertex of Angle: The point at which the lines containing an angle meet is known as its vertex.
 * Vertex of Ellipse: The endpoints of the major axis of an ellipse are its vertices.


 * Solid Geometry:
 * Vertex of Polyhedron: The corners of a polyhedron are known as its vertices.
 * Vertex of Solid Angle: The common vertex of the angles containing a solid angle is known as the vertex of that solid angle.

Linguistic Note
The plural of vertex is vertices.