Those of us who were at the conference and attended Dr. Allen's class where he talked about the etymology of the words "marriage," "husband," and "wife" now know that those are words invented by the RCC to go along with the false, pagan, Greco-Roman monogamy-only doctrine that they adopted and falsely labeled as "christian." So it is no wonder that the definition of the word "marriage" has been corrupted - it started out that way.
Therefore, I am making a conscious effort to not use those three pagan-Roman-Catholic words. But so far, I have not found any Biblically-correct terms that don't sound awkward.
For example, what does one woman in a covenant union with her man call the other woman who is also in a covenant union with the same man? "Sister wife" uses the pagan term, and just plain "sister" does not distinguish her from a woman who has the same parents.
I have started calling the woman with whom I am in a covenant union "my lady." Sometimes, I will use "my woman," but that sounds so - well, like a hillbilly. We are not "married" (well, legally, we are, because we "tied the knot" years before I learned God's Truth about a man and his woman or women) but rather, we are in a "covenant union."
Someday, someone on this forum will have a moment of inspiration and come up with the perfect terminology.
Soon, hopefully!