civil partnership 
(also chiefly US civil union)
noun
(In some countries) a legally recognized union of a same-sex couple, with rights similar to those of marriage.The state already has a statute banning recognition of same-sex marriages and civil unions....
- Given that lengthy list, I ask how anyone can possibly say that civil unions are not same-sex marriages.
- Support for civil unions and same-sex marriage has been steadily dropping in polls.
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