1. the highest point or peak of something
2. the most successful or important point; the climax
3. the pointed end or tip of something
Usage: geometry

Examples

• The mountain climbers reached the apex of the peak at sunrise.
• Her career reached its apex when she won the Nobel Prize.
• The apex of the triangle points upward.
• The company was at the apex of its success in the 1990s.
• The apex of the roof was damaged in the storm.
• He stood at the apex of the corporate hierarchy.
• The apex predator controls the entire food chain.