“It’s marriage, to call it any other name means there are other types of marriage, which there’s not.”
I agree with what you are trying to say. Only a man and woman bound together can make a “marriage.”
However, to me the term “traditional” means more than just a male and female married. It means it is a lifetime commitment to be “traditional.” Divorces are rare and not a something ever quickly considered or granted easily by law - there is no such thing a “no fault” divorce. “Traditional” marriage is not something you do after living with (a pre-marital sexual arrangement) another...it is what you do before any sex. In a “traditional” marriage world, sex is reserved for marriage only. A legal marriage is a license to engage in sex with that one other person of the opposite gender...and gives it the blessings and protection of law. It protects the couple, their children and family, and it protects the society they live in.
So, to me, “traditional marriage” does have meaning. I wished it did for many more.