Significant Other Definition

noun
A person having importance in, or influence on, another's life.
Webster's New World
A person with whom one has an intimate, often long-term and usually sexual, relationship.
Webster's New World
Synonyms:
other

(romantic partner): boyfriend, girlfriend, husband, spouse, wife.

Wiktionary

Other Word Forms of Significant Other

Noun

Singular:
significant other
Plural:
significant-others

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significant other

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