monandry

[ muh-nan-dree ]
/ məˈnæn dri /

noun

the practice or condition of having one husband at a time.
(of a female animal) the condition of having one mate at a time.

Origin of monandry

First recorded in 1850–55; monandr(ous) + -y3
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019