This is the 196th most frequent Portuguese word.
policiais
"Policiais" means "police officers" in English.
Here, 'policiais' is used as a noun in the plural form to refer to 'policemen' or 'police officers', denoting individuals working in law enforcement.
Os policiais chegaram rapidamente ao local do acidente.
The police officers arrived quickly at the accident scene.
In this sentence, 'policiais' functions as an adjective describing 'medidas', meaning measures implemented or related to the police.
As medidas policiais visam garantir a segurança da população.
The police measures aim to ensure the safety of the population.
In this instance, 'policiais' is a vocative form addressing the group of police officers directly.