n. (pl. apexes or apices)
1. the highest point.
2 a climax; a high point of achievement etc.
3 the vertex of a triangle or cone.
4 a tip or pointed end.
Etymology: L, peak, tip Apex - n. (also APEX) (often attrib.) a system of reduced fares for scheduled airline flights when paid for before a certain period in advance of departure.
Etymology: Advance Purchase Excursion