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significant

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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

a significant other

  (mainly American)

a person that someone is married to or who they have a serious sexual or romantic relationship with (not used with the ) The ad read, 'Take your significant other to the Café Carlyle for a romantic night out.'

See also: other, significant