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English word

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WORDNET DICTIONARY

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OXFORD DICTIONARY

THESAURUS

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**vertex**(n = noun.cognition) - the point of intersection of lines or the point opposite the base of a figure;
is a kind of
intersection,
intersection point,
point of intersection
**vertex**(n = noun.location) acme, apex, peak - the highest point (of something); "at the peak of the pyramid"
has particulars:
crown,
roof peak

is a kind of extreme, extreme point, extremum

A turning point; the principal or highest point; top; summit; crown; apex. [*1913 Webster*]

" The principal vertex of a conic section is, in the parabola, the vertex of the axis of the curve: in the ellipse, either extremity of either axis, but usually the left-hand vertex of the transverse axis; in the hyperbola, either vertex, but usually the right-hand vertex of the transverse axis."
[*1913 Webster*]

1 the highest point; the top or apex.

2 Geom. a each angular point of a polygon, polyhedron, etc. b a meeting-point of two lines that form an angle. c the point at which an axis meets a curve or surface.

3 Anat. the crown of the head.

Etymology

L vertex -ticis whirlpool, crown of a head, vertex, f. vertere turn