同居

1. Origins, structure, and basic meaning

• Structure: 同居 is read as どうきょ and is a noun and する verb for two or more people living together in the same house or dwelling.
• Basic usage: Living together since before marriage appears in 結婚前から同居する, while arranging to live with one's grandmother appears in 祖母と同居する.

2. Common pitfalls and similar expressions

• Living together regardless of relationship
  • It applies not only to partners but also to family members, relatives, friends, or others sharing a residence.
• Difference from 同棲
  • Unlike the term mainly used for unmarried romantic partners living together, this word covers a wider range of relationships.