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zenith

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The definition of a zenith is the highest point or peak.

(noun)

An example of a zenith is the highest point in the sky.
A ten-year period in the 1980s when a career was most successful is an example of a zenith.

See zenith in Webster's New World College Dictionary

noun

the point directly overhead in the sky or on the celestial sphere
the highest point; peak

Origin: ME senyth < MFr cenith < ML cenit < senit, scribal error for Ar samt, road, path (as in samt al-raʾs, zenith, lit., way of the head) < L semita, path, way

See zenith in American Heritage Dictionary 4

noun

The point on the celestial sphere that is directly above the observer.
The upper region of the sky.
The highest point above the observer's horizon attained by a celestial body.
The point of culmination; the peak: the zenith of her career. See Synonyms at summit.

Origin:

Origin: Middle English senith

Origin: , from Old French cenith

Origin: , from Medieval Latin

Origin: , from Arabic samt (ar-ra’s), path (over the head)

Origin: , from Latin sēmita, path; see mei-¹ in Indo-European roots

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