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vertex (n.)

1560s, "the point opposite the base in geometry," from Latin vertex "highest point," literally "the turning point," originally "whirling column, whirlpool," from vertere "to turn" (from PIE root *wer- (2) "to turn, bend"). Meaning "highest point of anything" is first attested 1640s.

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Definitions of vertex from WordNet

vertex (n.)
the point of intersection of lines or the point opposite the base of a figure;
vertex (n.)
the highest point (of something);
Synonyms: peak / apex / acme
From wordnet.princeton.edu