polygynously
/pəˈlɪdʒɪnəsli/ /pɒˈlɪdʒɪnəsli/adverb
1 Cultural Anthropol. With more than one wife; in a polygynous context.
2 Zoology. In a manner characterized by polygyny; with each male mating with several females.
Origin
1930s. From polygynous + -ly.