significant other

noun

: someone that you have a romantic relationship with : your husband, wife, boyfriend, or girlfriend

Full Definition of SIGNIFICANT OTHER

: a person who is important to one's well-being; especially : a spouse or one in a similar relationship

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1953

Medical Dictionary

noun significant oth·er \-ˈəth-ər\

: a person who is important to one's well-being; especially : a spouse or one in a similar relationship

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