summitn.[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. (Zol.) 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.()