summit

The topmost point or surface of a thing; the apex, the peak.

An assembly or gathering of the leaders of countries to discuss issues of international significance; also (loosely), an important or high-level gathering or meeting.

The highest point of a hill, mountain, or similar geographical feature.

A vertex of a polygon or polyhedron.

(figurative) The highest point of achievement, development, etc., that can be reached; the acme, the pinnacle.

The highest point of a canal, railway, road, etc.

(no longer used, rare) One of the two vertices of a crystal with a rhombohedral shape where the angles of each face are equal; also, the highest point of a crystal with a pyramidal or tetrahedral shape.

(figurative, no longer used) The highest level of political leadership.

(no longer used) Synonym of anther (“the pollen-bearing part of the stamen of a flower”) or (rare) stigma (“the sticky part of a flower that receives pollen during pollination”).

(informal) To reach the summit of (a mountain).

(informal) To reach the summit of a mountain.

To attend a summit.