I just find the word reminds me too much of business jargon

Yeah. It's sterile and contrived, IMHO. We have 'spouse'; it's on forms already. In the days before everyone was misspelling names for attention (Hi D'wayne; this is Duane) its less sterile sterility would be the perfect sterility for sterile people.

My wife and I were together decades before marriage. I can tell you no one cares about what your home life is like. You're just not that important. And that's the takeaway: use what you want, no one cares, and I'll clarify every damned time.