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significant other

The definition of a significant other is a person with whom you are in a romantic relationship.

(noun)

An example of significant other is your live-in boyfriend of ten years.

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See significant other in Webster's New World College Dictionary

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a person having importance in, or influence on, another's life
a person with whom one has an intimate, often long-term and usually sexual, relationship

See significant other in American Heritage Dictionary 4

noun

A person, such as a spouse or lover, with whom one shares a long-term sexual relationship.
A person, such as a family member or close friend, who is important or influential in one's life: “The most important variable in successful smoking cessation is the support of significant others in the new nonsmoker's life” (Carolyn Reuben).

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