Definition of vertex noun from the Oxford Advanced Learner's Dictionary



    BrE BrE//ˈvɜːteks//
    ; NAmE NAmE//ˈvɜːrteks//
    (pl. vertices
    BrE BrE//ˈvɜːtɪsiːz//
    ; NAmE NAmE//ˈvɜːrtɪsiːz//
    , vertexes)
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  1. 1(geometry) a point where two lines meet to form an angle, especially the point of a triangle or cone opposite the base
  2. 2(specialist) the highest point or top of something
  3. Word Originlate Middle English: from Latin, ‘whirlpool, crown of a head, vertex’, from vertere ‘to turn’.
See the Oxford Advanced American Dictionary entry: vertex