Something that is worth for many different things. That has many different values or meanings.
A polyvalent object is one that can be used as many different things. A polyvalent emotion is one that you can show in many different situations and get favorable results.
From Ancient Greek "poly: many" and Latin "valens, valentis: that is worth it"
- What a polyvalent chair, you can use it as a chair to sit and as a table to put things on it.
A non-gendered adjective for one's partner in a relationship based on polyamory or non-monogamy. It is used in place of boyfriend, girlfriend, wife, husband, and even partner, to show that you are taken, but not exclusively.
It can be used in conjunction with "primary" or "secondary" just as you would one of the previous alternatives.
"My polymate and I are going on a vacation together soon. We've been together for 16 months now."
"Oh, that's awesome. I hope the two of you have fun. Are you bringing your other girlfriend?"