your significant other

significant other

A person with whom one is in a serious romantic relationship. Primarily heard in US. Since Kelly didn't have a significant other, she attended her friend's wedding alone.See also: other, significant

your significant other

A person's significant other is their wife, husband, or the person they are having a relationship with. Poor Holly, she hadn't any significant other to bring with her. Well, we always work together, we live together — he's my significant other.See also: other, significant