This word is acceptable for play in the US & UK dictionaries that are being used in the following games:

• Lexulous
• Wordscraper
• Wordosaur

n. The highest point or part; the top.

n. The highest level or degree that can be attained.

n. The highest level, as of government officials.

n. A conference or meeting of high-level leaders, usually called to shape a program of action.

v. To climb to the summit of (a mountain).

verb-intransitive. To climb to the summit.

n. a peak; the top of a mountain

n. a gathering or assembly of leaders

v. To reach the summit of a mountain.

n. The top; the highest point.

n. The highest degree; the utmost elevation; the acme.

n. The most elevated part of a bivalve shell, or the part in which the hinge is situated.

n. The highest point; the top; the apex.

n. The highest point or degree; the utmost elevation; the maximum; the climax.

n. In mathematics: A point of a polyhedron where three or more surfaces (generally planes) meet.

n. A point at which a penultimate curve cuts two coincident parts of the same degenerate curve.

n. In bivalves, the highest part of the shell; the region in which the hinge is situated.

n. the top or extreme point of something (usually a mountain or hill)

v. reach the summit (of a mountain)

n. the highest level or degree attainable; the highest stage of development

n. a meeting of heads of governments

"Prior to Clinton's economic confab, the term summit had generally been given only to big international meetings or tête-à-têtes between world leaders."

summits   

attain    reach    arrive at    hit    make    gain    point    level    degree    stage   

summiteer   

top    height    apex    peak    acme   

plummet   

peak    ridge    crest    height    pinnacle    crag    hill    spire    ledge    plateau