1
: living in one's place of employment
a live-in caregiver
2
: being or involving people in a romantic or sexual relationship who live together and are not married
a live-in partner
a live-in relationship
live-in
noun
plural live-ins
lived in; living in; lives in
: to live in one's place of employment : live in another's home
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Merriam-Webster unabridged
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