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. 婚姻、离婚和同居的模式发生了巨大变化。 - cohabitation with somebody | cohabitation between A and B (figurative)
a period of cohabitation between a conservative government and a socialist president 保守党政府和社会党总统共处的时期