co·hab·i·ta·tion
noun/ˌkəʊˌhæbɪˈteɪʃn/
/ˌkəʊˌhæbɪˈteɪʃn/
[uncountable] (formal)- the state of living with another person and having a sexual relationship with them without being married
（无婚姻关系）同居 - There have been great changes in the patterns of marriage, divorce and cohabitation.
结婚、离婚、同居的模式发生了很大变化。 - cohabitation with somebody | cohabitation between A and B (figurative) a period of cohabitation between a conservative government and a socialist president
保守派政府和社会主义总统共存的时期
- There have been great changes in the patterns of marriage, divorce and cohabitation.