Arabic word for religion, faith.
There are several meanings of Deen. One meaning is honour, government, empire, monarchy and rulership. The second meaning is quite opposite to it, i.e. subordination, obedience, slavery, servitude and subjection. Third meaning is to account, to give judgment, and dispense reward and punishment of actions. The word Deen has been used in the Qur'an in all these three meanings.
"Deen with Allah is al-Islam" and
"And whoso seeketh as Deen other than Islam, it will not be accepted from him."