cohabitation
同居
Co·hab·i·ta·tion n.
1. The act or state of dwelling together, or in the same place with another.
2. Law The living together of a man and woman in supposed sexual relationship.
That the duty of cohabitation is released by the cruelty of one of the parties is admitted. --Lord Stowell.
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cohabitation
n : living together (as spouses) [syn: living together]