pin·na·cle (pĭn′ə-kəl) n.
1. the highest point or level, the culmination of, esp of fame, success, etc
2. (Physical Geography) a towering peak, as of a mountain
3. (Architecture) a slender upright structure in the form of a cone, pyramid, or spire on the top of a buttress, gable, or tower
4. to set on or as if on a pinnacle
5. to furnish with a pinnacle or pinnacles
6. to crown with a pinnacle