Marriage is a term with legal meaning, but that's not all that it is.
Marriage is the binding of persons by sacred oaths.
Marriage shelters parents and children together in stable families.
Marriage is the means by which communities recognize relationships as legitimate, and pledge to support them.
Marriage is a declaration that two people strive for permanency of their relationship, for better or for worse, for richer or for poorer, in sickness and in health.
As I said last February: come what may, these people are married. Look at them, look at their faces. The California Supreme Court may have annulled their legal certificates, but their marriages abide. The long fight is still before them, still before us, but their marriages abide.
What God hath joined together, let no man put asunder. Some things can't be taken away.