The highest point. / (geology) A tall, sharp and craggy rock or mountain. / (figuratively) An all-time high; a point of greatest achievement or success.

(transitive) To place on a pinnacle. / (transitive) To build or furnish with a pinnacle or pinnacles.

simple past tense and past participle of pinnacle

Having one or more pinnacles.

plural of pinnacle

Third-person singular simple present indicative form of pinnacle

present participle of pinnacle