Constable (noun)

1. An officer of the peace, typically having the power to make arrests and to maintain order in a town or rural district.
2. A police officer of the lowest rank in some British forces.

Origin:

From old french conestable ('steward, military commander'), from latin comes stabuli ('count of the stable').

Examples:

1. The constable was called to the scene of the disturbance.
2. The local constable was well-respected by the community.
3. He joined the police force as a constable and worked his way up through the ranks.