› (in mathematics) the point where two lines meet to form an angle, or the point that is opposite the base of a shape: the vertex of a triangle/cone/pyramidParts of geometrical shapes › the highest point of somethingEdges and extremities of objectsSurfaces of objectsHigher and lower points of achievementSuccess and achievementsFailures

(Definition of vertex from the Cambridge Advanced Learners Dictionary & Thesaurus
© Cambridge University Press)

What is the pronunciation of vertex?
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a small piece of cardboard that you put under a glass to protect a table surface in a pub or bar

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