This is the 7784th most frequent Japanese word.
同居
Living together.
In this sentence, "同居" is used to indicate the act of living together in the same residence with family.
私たちは家族と同居しています。
We live together with our family.
Here, "同居" is presented as a concept of co-residing, meant to evaluate its pros and cons.
同居することには利点も欠点もあります。
Living together has both advantages and disadvantages.
In this instance, "同居" is used to describe the beginning of cohabitation with a specified person.