Monogamy is the state or practice of being married to, or in a committed relationship with, only one partner at a time (pronounced muh-NOG-uh-mee /məˈnɒɡəmi/). It is the relationship structure most people in much of the world assume by default, and it stands in contrast to arrangements that involve more than one partner at once.
What does monogamy mean?
As a noun, monogamy refers to the condition of having a single spouse or romantic partner. The related adjective is monogamous, as in “a monogamous relationship,” and a person who practices it can be described the same way. The word covers both formal marriage and, in everyday use, any exclusive romantic or sexual partnership. In the study of animals, monogamy has a parallel meaning: the practice of an animal having only one mate, whether for a single breeding season or for life.
Dictionaries often note two overlapping senses. The strict sense is marital: being married to only one person at a time, which is how the word functions in law. The broader, everyday sense is relational: being romantically or sexually committed to a single partner, married or not. Both senses share the same core idea of exclusivity, and context usually makes clear whether someone means legal marriage or a committed partnership more generally.
Where does monogamy come from?
Monogamy entered English in the early 1600s. It came through French monogamie and Late Latin monogamia from Greek monogamia, meaning “single marriage,” built from monos (“one, single, alone”) and gamos (“marriage”). The specific sense “condition of being married to only one person at a time” is recorded by the early 1700s. The same Greek root gamos underlies a whole family of English words about marriage, including polygamy, bigamy, monogamist, and even words like gamete in biology, all sharing the theme of union or pairing.
How is monogamy used?
Monogamy is a neutral, everyday word that appears in ordinary conversation, relationship advice, law, religion, biology, and anthropology. It is not slang and carries no built-in judgment, though people naturally bring their own values to discussions of it. In modern relationship writing you will often see it contrasted not only with polygamy but with a wider family of terms grouped under non-monogamy, such as open relationships and polyamory. Writers also commonly distinguish lifelong monogamy from serial monogamy, the pattern of having one exclusive partner at a time across a sequence of relationships over a lifetime. In biology, researchers further separate social monogamy from sexual or genetic monogamy, because animals that pair up to raise young do not always mate exclusively.
Monogamy in law and culture
In legal terms, monogamy is the default marriage system across much of the world. In the United States and many other countries, a person may be legally married to only one spouse at a time, and marrying a second person while still married to the first is the crime of bigamy. Many religious and cultural traditions also uphold monogamous marriage as an ideal, while others historically permitted polygamy under certain conditions. Because of this, the word appears often in discussions of family law, religion, ethics, and anthropology. Sociologists studying modern relationships increasingly treat monogamy as one option among several rather than the only possibility, which is why it is now so frequently discussed alongside consensual non-monogamy, open relationships, and polyamory in relationship writing.
Example sentences
- “After years of dating, they decided monogamy was what they both wanted.”
- “In the United States, marriage law is based on monogamy, so you can be legally married to only one person.”
- “Some bird species practice monogamy, pairing with the same mate each breeding season.”
- “He described himself as a serial monogamist, always in one committed relationship at a time.”
- “The book compares monogamy with other relationship structures without judging any of them.”
- “Their marriage vows emphasized lifelong monogamy and mutual trust.”
Related and confusable terms
The clearest antonym is polygamy, having more than one spouse at once, which itself splits into polygyny (one man with multiple wives) and polyandry (one woman with multiple husbands). Bigamy is the specific act of marrying someone while already legally married to another person, and it is a crime in many places. Non-monogamy and polyamory describe consensual relationships involving more than two people, while an open relationship allows partners to see others by agreement. People sometimes confuse monogamy with celibacy, which means abstaining from sex or marriage entirely rather than committing to a single partner, and it is frequently misspelled as “monogomy.”
Common misconceptions
One misconception is that monogamy always means lifelong marriage to a single person. In practice, many people are serially monogamous, moving through several exclusive relationships over time. Another is that biological “monogamy” in animals guarantees sexual exclusivity; scientists distinguish social monogamy (sharing territory and raising young together) from genetic monogamy, and the two do not always match, as DNA studies of supposedly faithful bird species have shown. A further misconception is that monogamy is the only “natural” arrangement; anthropologists document a range of marriage systems across cultures. Finally, monogamy is a description of a relationship structure, not a moral scoreboard: the word itself simply names the arrangement of having one partner at a time.
Frequently Asked Questions
What does monogamy mean?
Monogamy is the practice of being married to or in a romantic or sexual relationship with only one partner at a time. It is the most common relationship structure in much of the world.
What is the opposite of monogamy?
The direct opposite is polygamy, being married to more than one person at once. More broadly, monogamy contrasts with non-monogamy, which includes open relationships and polyamory.
Where does the word monogamy come from?
It traces to Greek monos, meaning 'one' or 'single,' and gamos, meaning 'marriage,' by way of Late Latin monogamia and French. English recorded it in the early 1600s.
What is serial monogamy?
Serial monogamy describes having one exclusive partner at a time but moving through a series of such relationships over a lifetime, rather than staying with a single partner forever.
Is monogamy the law?
In the United States and many other countries, marriage law is monogamous, so a person may be legally married to only one spouse at a time. Being married to two people at once is bigamy, which is illegal there.
Does monogamy apply to animals?
Yes. Biologists describe animals that mate with a single partner as monogamous, though 'social monogamy' may last only one breeding season and does not always mean sexual exclusivity.