Summit

Part of speech: noun (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. 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.