Other forms: constables
A small-town police officer is sometimes known as a constable. If you live in an extremely tiny town, the constable may show up at your door when you dial 9-1-1 for help with a raccoon stuck in your chimney.
In Britain and Canada, a constable is the lowest-ranking officer in a police force. It's less common in the U.S., and the word's exact meaning varies a bit from state to state. In some places, a constable is only authorized to serve subpoenas to people who are required to testify in court. Other constables have full law enforcement powers. The Latin root of constable is comes stabuli, "attendant to the stables."