The practice of two people living together in a romantic relationship without being married.
From Medieval Latin cohabitatio, formed from co- + habitare (to dwell). The term entered English in the 15th century, primarily used in legal and religious contexts.
Cohabitation statistics completely transformed after the 1960s—in the U.S., it went from being illegal in some states to affecting how we think about marriage, taxes, and inheritance laws!
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