apex
When there’s no mountain left to climb and nothing but blue sky above, you know you’ve reached the highest peak — the apex.
Apex can mean the highest point in a literal sense, like climbing to the apex of the Eiffel Tower for a fabulous view of Paris. It also can be used to mean the highest point in a figurative sense. An actor who wins an Oscar can say she’s reached the apex of her career. If you’re describing more than one high point, you could add an -es to form the plural apexes, but apices would also be correct. And if you’re a botanist, you’d probably use apex to describe the tip of a flower or leaf.
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the highest point (of something)
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the point on the celestial sphere toward which the sun and solar system appear to be moving relative to the fixed stars
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synonyms:
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Antonyms:
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antapex
the point opposite in direction from the solar apex; the point the solar system is moving away from
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type of:
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celestial point
a point in the heavens (on the celestial sphere)
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antapex