domestic partner
significant other
spousal equivalent
spouse equivalent

The Federal tax treatment of health benefits for domestic partners is an example.

Domestic partners must be at least 18 years old, the same age required for marriage.

They and 38 other couples became the state's first domestic partners.

One police official he was a roommate, not a domestic partner.

"And at this point I believe that should include certified domestic partners."

He is survived by his domestic partner, parents, two brothers and a sister.

They previously were domestic partners registered in the state of California.

Davis is not married, nor does she have a domestic partner, so she'll be going the route of a single mother.

In recent years, many private companies and local governments have voluntarily decided to offer benefits to domestic partners.