Summit (noun)

1. The highest point of a mountain or hill.
2. The highest level or degree of something.
3. A meeting or conference between the leaders of different countries or organizations.
4. An important meeting or conference for discussion of a particular topic.

Origin:

From middle english som(m)et, from old french sommet, from latin summitās ("the highest point, top"), from summus ("highest, to.p")

Examples:

1. The summit of Mount Everest is the highest point on Earth.
2. He reached the summit of his career when he became the CEO.
3. The summit between the leaders of the two countries was held in a neutral country.
4. The summit of the G7 was held to discuss the global economy.
5. The summit of the climate change conference was held to discuss the global warming.