A "significant other" refers to a person with whom someone has a close, romantic relationship. This term is often used to describe a partner in a committed relationship, such as a boyfriend, girlfriend, spouse, or domestic partner. The phrase emphasizes the importance of the relationship in an individual's life, highlighting emotional support and companionship. In many cultures, having a significant other is considered a key aspect of personal fulfillment and social connection. This relationship can involve shared experiences, mutual respect, and love. People often seek to build a life together with their significant other, which may include cohabitation, marriage, or family planning.