constable

Short definition from Wiktionary

Noun

1. 1
   One holding the lowest rank in most Commonwealth police forces. (See also chief constable.)
2. 2
   A police officer or an officer with equivalent powers.
3. 3
   An officer of a noble court in the Middle Ages, usually a senior army commander. (See also marshal).
4. 4
   The warden of a castle.
5. 5
   An elected or appointed public officer, usually at municipal level, responsible for maintaining order or serving writs and court orders.
6. 6
   An elected head of a parish (also known as a connétable)
7. 7
   A large butterfly, Dichorragia nesimachus, family Nymphalidae, of Asia.

Verb

1. 1
   To act as a constable or policeman.

Proper noun

1. 1
   An English surname originating as an occupation from Old French conestable (“constable”).
2. 2
   A town in Franklin County, New York; named for landowner William Constable.
3. 3
   John Constable, English painter.