Significant other (SO) colloquially used as a gender-neutral term for a person's partner in an intimate relationship[1] without disclosing or presuming anything about marital status, relationship status, or sexual orientation. Synonyms with similar properties include sweetheart, better half, spouse, domestic partner, lover, soulmate, or life partner.
In psychology, a significant other is any person who has great importance to an individual's life or well-being. In sociology, it describes any person or persons with a strong influence on an individual's self concept.
In social psychology, a significant other is a parent, uncle/aunt, grandparent, guardian or teacher — the person who guides and takes care of a child during primary socialization. The significant other protects, rewards, and punishes the child as a way of aiding the child's development.
https://en.wikipedia.org/wiki/Significant_other
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