Definition of vertex
1 : the top of the head
2a : the point opposite to and farthest from the base in a figure
b : 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
c : a point where an axis of an ellipse, parabola, or hyperbola intersects the curve itself
3 : a principal or highest point : summit the vertex of the hill
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Time Traveler for vertex
The first known use of vertex was in the 14th century
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