significant other
From Longman Dictionary of Contemporary Englishsignificant othersigˌnificant ˈother noun [countable] your husband, wife, girlfriend, or boyfriendExamples from the Corpussignificant other• In your case, the significant other is also a significant bother.• So, how can you get useful feedback from your significant other, aside from signing up for couples' counseling classes?• Your significant other must agree to provide comments in the most open and positive way possible.