significant other
noun
Sociology.
a person, as a parent or peer, who has great influence on one's behavior and self-esteem.
a spouse or cohabiting lover.
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British Dictionary definitions for significant other
significant other
noun
US informal
a spouse or lover
Cultural definitions for significant other
significant other
A person whose close relationship with an individual affects that individual's behavior and attitudes. A significant other is usually a family member, spouse, child, employer, coworker, friend, or lover, who serves as a role model or whose acceptance and approval is sought.