polyamorynoun [ U ]
uk/ˌpɒl.iˈæm.ər.i//ˌpɑː.liˈæm.ɚ.i/the practice of having sexual or romantic relationships with two or more people at the same time:
For him, polyamory is more honest and natural than monogamy.
Compare
monogamy
polygamy
polyamorous
adjective uk/ˌpɒl.iˈæm.ə.rəs//ˌpɑː.liˈæm.ɚ.əs/
a polyamorous household