A person who lives together with another person, typically in a romantic relationship without being married.
From co- (together) + habitant (dwelling inhabitant), from Latin habitans meaning 'dwelling.' The term emerged in English in the 17th century to describe people sharing living quarters.
Interestingly, 'cohabitant' became much more common in the 20th century as cultural attitudes changed; it's a word that reflects how society needed new language to describe relationships that were once considered scandalous!
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