significant other

noun

1. Sociology. a person, as a parent or peer, who has great influence on one's behavior and self-esteem.
2. a spouse or cohabiting lover. : SO, S.O.

significant other

noun

1. informal.
   a spouse or lover

Example Sentences

Maybe your plans entail your entire family—parents, aunts, grandparents, nieces, cousins, in-laws, dogs, turtles, significant others—sharing a lovely holiday weekend under the same roof.

From Popular-Science

In “Baggage,” Cumming examines his relationships to his family, significant others and himself.

From Washington Blade

This was before I learned the ironclad rule that one should never try to teach a significant other a sport, especially if one wants the other to remain significant.

From Washington Post

Because many shelters are single-sex or sex-segregated facilities, often people are asked to separate from their significant others, which can be a deal breaker.

From Vox

We have a card that says, “You are cordially invited to invade my personal space,” which is funny, considering how much time we’ve spent with our significant others this year.

From Vox