1. The point above the observer that is directly opposite the nadir on the imaginary sphere against which celestial bodies appear to be projected
   "The sun reached its zenith at noon"
    
2. The highest point or peak of something
   "The empire reached its zenith in the 16th century"

Derived forms: zeniths

Type of: celestial point

Antonym: nadir

Part of: celestial sphere, empyrean, firmament, heavens, sphere, vault of heaven, welkin

Encyclopedia: Zenith, Pennsylvania