Summit

Merriam-Webster Online Dictionary
summit (noun)
1.
- top apex , especially the highest point - peak
2.
the topmost level attainable - the summit of human fame
3.
a) the highest level of officials , especially the diplomatic level of heads of government
b) a conference of highest-level officials (as heads of government) - an economic summit
summit (verb)
intransitive verb
1.
to participate in a summit conference
2.
to climb to the summit - summited on May 29