Meaning of zenith in English
Noun
1.
(a) Astronomy, ｟the[one’s] -｠ the point of the celestial sphere in the sky directly above the observer; the highest point reached by a given celestial body
(b) the sky; the heavens
(c) the highest point of one’s fame, fortunes etc.; culminating point
The sun was well past the zenith.
at the zenith of one's fame
be at one's zenith
attain[pass] its zenith
At the zenith of its power, Mongol Empire ruled about 25 percent of the land on the earth.