summit

sum·mit

1. The highest point or part; the top.
2. The highest level or degree that can be attained.
3. a. The highest level, as of government officials.
   b. A conference or meeting of high-level leaders, usually called to shape a program of action.

Origin: Middle English somet, from Old French sommette, diminutive of som, top, from Latin summum, from neuter of summus, highest; see uper in Indo-European roots.