This is the 288th most frequent Catalan word.
policia
Police.
In this context, 'policia' is used to refer to the police force as a collective entity.
La policia va arribar al lloc dels fets ràpidament.
The police arrived at the scene quickly.
Here, 'policia' designates a single police officer.
Un policia em va ajudar a buscar el meu gat perdut.
A policeman helped me look for my lost cat.
In this usage, 'policia' refers to the police as an institution that can be contacted for help.