1
formal
: the strongest or most successful period of time
At its zenith [=peak] in the 1980s, the company employed more than 300 people.
That was the zenith [=the highest point] of her career.
2
technical
: the highest point reached in the sky by the sun, moon, etc.
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“Zenith.” Merriam-Webster.com Simple Definition, Merriam-Webster, https://www.merriam-webster.com/simple/zenith. Accessed 18 Jun. 2026.
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