significant

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.

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.'

Common Names:

Name	Pronounced	Usage
Avril	av-REEL (French), AV-ril (English)	French (Rare), English (Rare)
Sophocles	SAHF-u-kleez (English)	Ancient Greek (Latinized)
Aria	AHR-ee-ə	English
Archbold	['a:tʃbəuld]
ÉDith	e-DEET	French
ÙNa	OO-na	Scottish