It's actually quite simple. You define it by what it is, not by how they talk about it. Here's a very straightforward test: If one of the plural wives divorces the husband, does that dissolve the other marriages? If so, then it's a single mega-marriage; but if not, then it's multiple concurrent marriages that are distinct from one another. Here's a thought experiment: suppose a couple get married, and it's the first marriage for both of them. Both parties believe in polygamy, so they h