Collins English-English Dictionary

pinnacle ['pɪnək^əl]

1. 1. n the highest point or level, esp of fame, success, etc

2. 2. n a towering peak, as of a mountain

3. 3. n a slender upright structure in the form of a cone, pyramid, or spire on the top of a buttress, gable, or tower

4. 4. vt. [tr] to set on or as if on a pinnacle

5. 5. vt. to furnish with a pinnacle or pinnacles

6. 6. vt. to crown with a pinnacle

7. 7. vt. [Etymology] C14: via Old French from Late Latin pinnaculum a peak, from Latin pinna wing