1. The ability to assess situations or circumstances shrewdly and to have sound conclusions: It was a marvelous effort of perspicacity for Samuel to discover that he loved his wife when he first met her before they got married.
2. A clearness of understanding or insight and discernment: Perspicacity was a characteristic of Paul's character and it was a political advantage for him when he was running for his senate seat in congress.
3. An acuteness of discernment or perception:Jack was very quick in grasping the central point of the lessons and was always correct in interpreting the meaning of the topics. His perspicacity was of great use to his friends in school!