IPA: //ˌpɒliˈæməri//
KK: /pɑlɪˈæməri/
A way of having romantic or sexual relationships with more than one person at the same time, where everyone involved knows about and agrees to it.
They practice polyamory, allowing each partner to have multiple relationships openly.
Polyamory → It is formed from "poly-" (from Greek "polus", meaning many) and "amor" (from Latin, meaning love). The word describes the practice of engaging in multiple loving relationships simultaneously.
Think of 'many' ('poly-') loves ('amor') to remember that polyamory means having multiple loving relationships.
No commonly confused words.