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Zenith
The zenith is an imaginary point directly “above” a particular location, on the imaginary celestial sphere. “Above” means in the vertical direction opposite to the apparent gravitational force at that location. The opposite direction, i.e. the direction in which gravity pulls, is toward the nadir. The zenith is the “highest” point on the celestial sphere.
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Apex (noun)
The “highest” or the greatest point of something.
“the apex of the building”
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Apex (noun)
The moment of greatest success, expansion, etc.
“the apex of civilization”
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Apex (noun)
The topmost vertex of a cone or pyramid (in their conventional orientation).
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Apex (noun)
The “pointed” fine end of something.
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Apex (noun)
The lowest part of the human heart.
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Apex (noun)
The end of a leaf, petal or similar organ opposed to the end where it is attached to its support; the tip.
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Apex (noun)
The point on the celestial sphere toward which the sun appears to move relative to nearby stars.
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Apex (noun)
The lowest point on a pendant drop of a liquid.
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Apex (noun)
The end or edge of a vein nearest the surface.
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Apex (noun)
A diacritic in Classical Latin that resembles and gave rise to the acute.
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Apex (noun)
A diacritic in Middle Vietnamese that indicates /ŋ͡m/.
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Zenith (noun)
The point in the sky vertically above a given position or observer; the point in the celestial sphere opposite the nadir.
“nadir|perigee”
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Zenith (noun)
The highest point in the sky reached by a celestial body.
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Zenith (noun)
Highest point or state; peak.
“acme|apogee|culmination|pinnacle”
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Apex (noun)
a system of reduced fares for scheduled airline flights and railway journeys which must be booked and paid for before a certain period in advance of departure
“Apex fares”
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Apex (verb)
reach a high point or climax
“melodic lines build up to the chorus and it apexes at the solo”
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Apex (verb)
turn (a corner) very close to the edge of the track
“he understands when to apex a corner”
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Zenith (noun)
the time at which something is most powerful or successful
“in 1977, punk was at its zenith”
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Zenith (noun)
the point in the sky or celestial sphere directly above an observer.
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Zenith (noun)
the highest point reached by a given celestial object
“the sun was well past the zenith”