## Definition of vertex

**:**the top of the head

**:**the point opposite to and farthest from the base in a figure

**:**a point (as of an angle, polygon, polyhedron, graph, or network) that terminates a line or curve or comprises the intersection of two or more lines or curves

**:**a point where an axis of an ellipse, parabola, or hyperbola intersects the curve itself

**:**a principal or highest point

**:**summit

- the vertex of the hill