I. ˈzēnə̇th, chiefly Brit ˈzen- noun
( -s )
Etymology: Middle English cenit, senyth, from Middle French cenith, from Medieval Latin, from Old Spanish zenit, modification (probably due to scribal error) of Arabic samt ( ar-ra's ) way (of the head)
1. : the point of the celestial sphere that is vertically above the observer and directly opposite the nadir or that is vertically above any given point on the earth's surface
2.
a. : the vault of the sky : the upper region of the heavens
b. : the highest point reached in the heavens by a celestial body
3. : the point of culmination : the greatest height : acme , peak , summit
classical studies reached their zenith in the twelfth century — H.O.Taylor
at the zenith of his fame — Alvin Redman
4. or zenith blue : a light purplish blue that is redder than lupine and bluer and paler than average periwinkle
II. adjective
: located at or relating to the zenith