It isn’t being fundamentally re-defined, we are just making it more inclusive.<quoted text>
Close, but no cigar.
It's the reason marriage, as a distinct privileged relationship, exists in the first place. Otherwise why would it matter who married who, or didn't marry who?
Individuals can access legal marriage as part of a pairing recognized by law, not couples. Why should marriage be fundamentally redefined?
The thousands upon thousands of same sex couples legally married in the US today certainly did not re-define my marriage in any way at all.