the wife of a head of state or head of government

A marriage system where one man is legally wedded to only one woman at a time.

(idiom) a single person guards the pass; used to describe a position that is easy to defend and difficult to attack, or a defender who is exceptionally brave

a marriage system in which one man has more than one wife at the same time

polygyny; polygamy; the system of one husband having multiple wives

one man guarding the pass can stop ten thousand from entering; describes a strategic pass that is easy to defend and difficult to attack

the practice of being married to only one person at a time