1) Having one husband at a time 2) Marriage 3) Matrimony 4) Spousal relationship 5) Union 6) Wedlock 
marriage to only one man at a time
• (n.) The possession by a woman of only one husband at the same time; -- contrasted with polyandry.
Mo·nan'dry noun [ See Monandria .] The possession by a woman of only one husband at the same time; -- contrasted with polyandry . 
[n] - having one husband at a time
monandrous, monandry 1. A reference to a female who mates with a single male or the custom of having only one husband at a time. 2. In botany, belonging to a class of flower that has a single stamen.
noun the state of having only one husband at a time
the practice or condition of having one husband at a time. · (of a female animal) the condition of having one mate at a time.