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. (Science: zoology) 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.
Origin: F. Sommet, dim. Of OF. Som, sum, top, from L. Summum, from summus highest. See Sum.