zenith
[ zee-nith or, especially British, zen-ith ]
the time at which something is most powerful or successful
USE 1
The Renaissance period was the zenith of art and culture in Europe, with masters like Michelangelo and Leonardo da Vinci leading the way.
USE 2
At the zenith of his career, the athlete won gold medals in both the Olympics and the World Championships, a feat rarely achieved.
USE 2
The company’s profits hit their zenith in the fourth quarter, breaking all previous records.
