Definition of zenith
1
: the point of the celestial sphere that is directly opposite the nadir and vertically above the observer — see azimuth illustration
2
: the highest point reached in the heavens by a celestial body
3
: culminating point : acme
at the zenith of his powers— John Buchan
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Merriam-Webster unabridged
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Time Traveler for zenith
The first known use of zenith was in the 14th century
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