monogamy
词根词缀：
bigamy n. 重婚罪
bi 二 + gam 婚姻 + y 表行为 →〔同时存在于〕两个婚姻 → 重婚罪
monogamy n. 一夫一妻制
mono 一个 + gam 婚姻 + y 表名词 → 一夫一妻制
polygamy n. 一夫多妻制
poly 多个 + gam 婚姻 + y 表名词 → 一夫多妻制
数据来源：新东方英语词汇速记大全
相关例句：
Although they're not married, thay've lived in a state of monogamy for years.
虽然他们没有结婚，但是他们生活在一夫一妻状态中有很长时间了。
Can prostitution disappear without dragging monogamy with it into the abyss?
能叫卖淫消失而不叫一夫一妻制与它同归于尽吗？
Concubines resulted from the marriage system of monogamy with several concubines, and the system of concubines developed to the top in the Qing Dynasty.
妾是古代一夫一妻多妾婚姻制度的产物，妾制到清代发展到顶峰。
Monogamy guarantees that every man can find a wife.
一夫多妻保证了每位男性都能找到一名妻子。
Between pairing marriage and monogamy intervenes a period in the upper stage of barbarism when men have female slaves at their command and polygamy is practiced.
在野蛮时代高级阶段，在对偶婚制和一夫一妻制之间，插入了男子对女奴隶的统治和多妻制。
FROM an evolutionary perspective, monogamy looks good for females and bad for males.
从进化的角度来讲，单配制有利于雌性，而对雄性却不然。