I've been reading all the exchanges relating to Prof. Sargent's op-ed piece, and have to have my say. Yes, we are talking about a word here (marriage), and yes, that word has had a certain meaning. But the English language is one of the most malleable in the world, and definitions are constantly changing as society and its needs change. If not, students wouldn't need Cliff notes (oops, I think I just dated myself) when reading Shakespeare, as we would all still be speaking Elizabethan English.
The question, as I see it, is has society changed enough, or in such a way, as to require the definition to be written? Perhaps, perhaps not. Next Tuesday should tell.