1. The highest point or part, as of a hill, a line of travel, or any object; top; apex.
2. The greatest point of attainment or aspiration: the summit of one's ambition: Joe is now at the summit of his career as a salesman for his company.
3. A lavish state or degree.
4. The prominent level of diplomatic or other governmental officials: A meeting of nations was planned for the summit next week.
5. Etymology: from Latin summus, "highest".