Meaning of “police” - Learner’s Dictionary

police

noun [ plural ] uk us /pəˈliːs/

A2 the official organization that makes people obey the law and that protects people and places against crime, or the people who work for this organization:

I heard a gun shot and decided to call the police.
A 30-year-old taxi driver is being interviewed by police.
a police helicopter
a police investigation

(Definition of “police noun” from the Cambridge Learner’s Dictionary © Cambridge University Press)