1. A policeman: The constable of the town, and one of the lowest rank, proved to be of great value when he caught the culprit one evening.
2. A lawman; a peace officer: The constable, or patrolman, who was quite a calm fellow and helped to keep the town a pleasant place to live and free from strife, was well-liked by all the citizens.
3. The governor of a royal castle: In the Middle Ages, a constable was an officer or keeper in a noble court or fortress and usually an army commander in a senior position.