apex

Noun
  1. The highest point (of something) (synset 108695539)
    "at the peak of the pyramid"
    hypernym: extreme, extreme point, extremum - the point located farthest from the middle of something
    hyponym:
    • crown - the part of a hat (the vertex) that covers the crown of the head
    • roof peak - the highest point of a roof
    synonym: acme, peak, vertex
  2. The point on the celestial sphere toward which the sun and solar system appear to be moving relative to the fixed stars (synset 108511997)
    hypernym: celestial point - a point in the heavens (on the celestial sphere)
    part meronym: celestial sphere, empyrean, firmament, heavens, sphere, vault of heaven, welkin - the apparent surface of the imaginary sphere on which celestial bodies appear to be projected
    synonym: apex of the sun's way, solar apex

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