Just for clarification, I see the sort of terms we're looking for not as being for the general public, nor as for using on a day to day basis with your partner(s) but rather for descrbing *types* of relationships within our community.
For example, on this board, you might find yourself typing "Maris is my girlfriend of 6 months, we've decided that ours is in most ways a secondary relationship, and..." or "My partner Alan and I don't believe in marriage, but we've been together for 6 years and ours is definitely an anchor relationship, and..." Re-read the original post for more clarification on why such terminology can be helpful.
Me, 30ish bi female, been doing solo poly for roughly 5 years. Gia, Clay, and Pike, my partners. Davis, ex/friend/"it's complicated." Eric, Gia's husband. Bee, Gia and Eric's toddler.