This is the 937th most frequent Chinese word.
居
"居" means "to live," "to reside," or "to dwell."
居室 (room) - Here, '居' is used to refer to a place of residence or habitation.
居室内安静无比。
The room is profoundly quiet.
居于 (reside) - In this context, '居' is used as a verb meaning to reside or dwell in a place.
他居于城市的边缘。
He resides on the outskirts of the city.
居安 (in safety) - Here, '居' implies a state of being in a specific condition or situation.