A metamour is someone who is your partners partner, but with whom you have no romantic relationship. This can be your partners other boyfriend or girlfriend or your partners spouse. You didnt pick them, your partner picked them.
What is a vee relationship?
Vee: A vee relationship is made up of three partners and gets its name from the letter “V,” in which one person acts as the “hinge” or “pivot” partner dating two people. The other two people are not romantically or sexually involved with each other.
What is a unicorn in a polyamorous relationship?
In the world of polyamory, a unicorn is a person who is invited into an existing couple to date and play with. The couple can make demands but the unicorn cannot do anything that could cause any inconvenience for the couple.