pris‧on‧er S3 W2 [countable]
someone who is kept in a prison as a legal punishment for a crime or while they are waiting for their trial [↪ guard, imprison]:
Relationships between the staff and the prisoners are good.
Prisoners here only serve short sentences.
remand prisoner British English (=someone who is in prison waiting for their trial)
The organization is arguing for the release of political prisoners (=people in prison because of their political opinions).
someone who is taken by force and kept somewhere [= captive]
hold/keep somebody prisoner
The guerillas kept her prisoner for three months.
He was being held prisoner.
Our pilot was taken prisoner.
The army advanced, taking 200,000 prisoners.
someone who is in a place or situation from which they cannot escape:
He is a prisoner of his own past.