Main Entry: ze·nith

Pronunciation: \ˈzē-nəth, Canada also & British usually ˈze-nəth, -nith\

Function: noun

Etymology: Middle English cenyth, senyth, from Middle French cenit, from Medieval Latin, from Old Spanish zenit, modification of Arabic samt (al-ra's) way (over one's head)

Date: 14th century

1 : the point of the celestial sphere that is directly opposite the nadir and vertically above the observer — see azimuth illustration
2 : the highest point reached in the heavens by a celestial body
3 : culminating point : acme <at the zenith of his powers — John Buchan>