Definitions

1. noun

the highest or uppermost point of something, such as a mountain or a building

“The observation deck on the skyscraper reached the pinnacle of the city’s skyline.”

2. noun

the most successful or greatest achievement of something

“Her book was the pinnacle of her writing career, winning several literary awards.”

3. verb

to reach the highest point or the most successful level of something

“The company’s profits began to pinnacle, and they started to expand their operations.”