Source : Webster's Revised Unabridged Dictionary (1913)

Summit \Sum"mit\, n. [F. sommet, dim. of OF. som, sum, top, from
   L. summum, from summus highest. See {Sum}, n.]
   1. The top; the highest point.

            Fixed on the summit of the highest mount. --Shak.

   2. The highest degree; the utmost elevation; the acme; as,
      the summit of human fame.

   3. (Zo["o]l.) The most elevated part of a bivalve shell, or
      the part in which the hinge is situated.

   {Summit level}, the highest level of a canal, a railroad, or
      the like, in surmounting an ascent.

Source : WordNet®

summit
     n 1: the highest level or degree attainable; "his landscapes were
          deemed the acme of beauty"; "the artist's gifts are at
          their acme"; "at the height of her career"; "the peak of
          perfection"; "summer was at its peak"; "...catapulted
          Einstein to the pinnacle of fame"; "the summit of his
          ambition"; "so many highest superlatives achieved by
          man"; "at the top of his profession" [syn: {acme}, {height},
           {elevation}, {peak}, {pinnacle}, {superlative}, {top}]
     2: the top point of a mountain or hill; "the view from the peak
        was magnificent"; "they clambered to the summit of
        Monadnock" [syn: {peak}, {crown}, {crest}, {top}, {tip}]
     3: a meeting of heads of governments [syn: {summit meeting}]
     v : reach the summit of a mountain; "Many mountaineers go up Mt.
         Everest but not all summit"