zenith

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ze·nith / ˈzēni[unvoicedth]/ • n. [in sing.] the highest point reached by a celestial or other object: the missile reached its zenith and fell. ∎  the point in the sky or celestial sphere directly above an observer.The opposite of nadir. ∎  the time at which something is most powerful or successful: under Justinian, the Byzantine Empire reached its zenith of influence.DERIVATIVES: ze·nith·al / -nə[unvoicedth]əl/ adj.

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