Etymology
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zenith (n.)

"point of the heavens directly overhead at any place," late 14c., from Old French cenith (Modern French zénith), from Medieval Latin cenit, senit, bungled scribal transliterations of Arabic samt "road, path," abbreviation of samt ar-ras, literally "the way over the head." Letter -m- misread as -ni-.

The Medieval Latin word could as well be influenced by the rough agreement of the Arabic term with classical Latin semita "sidetrack, side path" (notion of "thing going off to the side"), from se- "apart" + *mi-ta-, a suffixed form of PIE root *mei- (1) "to change, go, move." Figurative sense of "highest point or state" is from c. 1600.

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Definitions of zenith

zenith (n.)
the point above the observer that is directly opposite the nadir on the imaginary sphere against which celestial bodies appear to be projected;
From wordnet.princeton.edu