Definition of vertex in US English:



  • 1The highest point; the top or apex.

    • ‘But what vertices of anxiety lie behind the gentle opposition of town and country, youth and age when Janice arrives in Dulwich.’
    • ‘Balancing on the vertex requires enormous training in concentration.’
    • ‘Now in a single move a coin must slide between adjacent vertices.’
    • ‘The game begins at one particular vertex, corresponding to the starting position of the game.’
    apex, peak, tip, top, mountaintop, summit, pinnacle, crest, brow, crown, height, highest point
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    1. 1.1Anatomy The crown of the head.
      • ‘As the head clears the pubic symphysis, the vertex is pulled upward at an angle of 45 degrees to the floor.’
      • ‘This will protect the perineum and assist in extension of the head as the vertex passes the symphysis.’
      • ‘She has been left with extensive scars and areas of alopecia on the vertex, occipital, and right parietal regions of her head.’
      • ‘This is followed by thinning over the vertex and then, eventually, complete loss of hair over the crown.’
      • ‘The Sahasrara or crown chakra is related to the pituitary gland and externalizes at the vertex of the scalp.’
  • 2Geometry
    Each angular point of a polygon, polyhedron, or other figure.

    • ‘The frequency of each morph increases from the one side of the triangle to the opposite vertex.’
    • ‘The vertices were then connected to their neighbours to create the polygons.’
    • ‘He also found another solution where the three bodies were at the vertices of an equilateral triangle.’
    • ‘Einstein observes that the Menelaus theorem is symmetric with respect to the vertices of the triangle.’
    • ‘Now add parallels beyond those in the same direction, through the vertices of the largest triangle.’
    1. 2.1 A meeting point of two lines that form an angle.
      • ‘In wild-type flies, the head vertex is symmetrical and composed of three distinct domains.’
      • ‘Bond angles are calculated using the central atom as the vertex of the bond angle.’
      • ‘An undirected edge connecting these two vertices indicates this relationship.’
      • ‘The vertex representing k is the final state of the kth chain.’
      • ‘Two adjacent vertices must be of the same colour.’
    2. 2.2 The point at which an axis meets a curve or surface.
      • ‘Think of the two islands and the mainland as vertices with the paths between these nodes called arcs.’
      • ‘A graph is a mathematical structure consisting of vertices connected by edges.’
      • ‘A coin may only be placed by dragging the cursor along an edge from one vertex to another.’
      • ‘Each vertex unit can have one vector and one scalar operation in flight simultaneously.’
      • ‘The three 6-cycles pairwise intersect in two non-adjacent vertices.’


Late Middle English: from Latin, ‘whirlpool, crown of a head, vertex’, from vertere ‘to turn’.