patrol patrol /pəˈtroʊl/

noun

1. () A detachment used for security or reconnaissance  ( patrol )
   a detachment used for security or reconnaissance
   
2. () The activity of going around or through an area at regular intervals for security purposes  ( patrol )
   the activity of going around or through an area at regular intervals for security purposes
     The police officer went on patrol to ensure the neighborhood's safety.
   The police officer went on patrol to ensure the neighborhood's safety.
   
3. A group that goes through a region at regular intervals for the purpose of security  ( patrol )
   a group that goes through a region at regular intervals for the purpose of security
   

verb

1. () Maintain the security of by carrying out a patrol  ( police , patrol )
   maintain the security of by carrying out a patrol
     The security guard diligently patrolled the premises to ensure the safety of the building.
   The security guard diligently patrolled the premises to ensure the safety of the building.