Don’t like the definition of a word? Just redefine it.
If they want to redefine “marriage” this opens the door to a whole host of new definitions: male, female, adult, child, consent, sober, legal, robbery, armed, divorce, truth, justice, rights, insanity, normal, government, voter, immigrant, election, treaty, majority, army, nation, war, peace, “is”, ....
Why stop at just “marriage” ???
Like some brilliant man said what is to stop a man from marrying his son so all inherintance taxes are avoided.