significant other
Noun
Meaning
a person (not necessarily a spouse) with whom you cohabit and share a long-term sexual relationship
Source: WordNetSynonyms
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Examples
I think one of the most important things in a relationship is caring for your significant other through good times and bad.
My significant other right now is myself, which is what happens when you suffer from multiple personality disorder and self-obsession.
Look your significant other in the eyes, make that connection.
It's very different than it use to be. I think everybody has a lot more experience in how to be in a relationship - whether it's a marriage or a significant other or a business or a friend.
If you make your best friend and your significant other the same person, you don't have to disconnect to go tell your girlfriend everything.
The older you get, the more you realize you're drifting toward a direction, and sometimes your significant other drifts into an opposite direction. You can't blame anybody for it.