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Definition of Significant other
1. Noun. A person (not necessarily a spouse) with whom you cohabit and share a long-term sexual relationship.
Exact synonyms: Domestic Partner, Spousal Equivalent, Spouse Equivalent
Generic synonyms: Individual, Mortal, Person, Somebody, Someone, Soul
Specialized synonyms: Lover, Better Half, Married Person, Mate, Partner, Spouse
Generic synonyms: Individual, Mortal, Person, Somebody, Someone, Soul
Specialized synonyms: Lover, Better Half, Married Person, Mate, Partner, Spouse
Definition of Significant other
1. Noun. (informal) One's romantic partner, regardless of marital status or gender. ¹
¹ Source: wiktionary.com