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The definition of apex

4 Definitions of: apex

    1. noun, the highest point; vertex
    2. noun, the pointed end or tip of something
    3. noun, a pinnacle or high point, as of a career, etc
    4. noun, Also called: solar apex astronomy the point on the celestial sphere, lying in the constellation Hercules, towards which the sun appears to move at a velocity of 20 kilometres per second relative to the nearest stars
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From Collins