marriage certificate 
noun British
A copy of the record of a legal marriage, with details of names, date, etc.Just for good measure, the happy pair enclosed a copy of their marriage certificate, and an affidavit from a lawyer in Canada, where they'd celebrated their wedding a few months earlier, confirming that all was legal and proper....
- To register, residents are required to show a family identity card, a birth certificate, a marriage certificate or any other document that can help prove their identity.
- And, if you are making changes, it's a good idea to take documentation with you, such as a marriage certificate or birth certificate.