Summit /(?)/

Sum·mit

Summit

n.
  1. The top; the highest point.
    Fixed on the summit of the highest mount.
  2. The highest degree; the utmost elevation; the acme; as, the summit of human fame.
  3. The most elevated part of a bivalve shell, or the part in which the hinge is situated. (Zool.)

Phrases & Compounds
Summit level
the highest level of a canal, a railroad, or the like, in surmounting an ascent.