Adultery Definition: Meaning, Examples, and Context For 2026
Adultery means having a sexual relationship with someone other than your spouse while you are married. The word is often used when discussing marriage, relationships, religion, ethics, and law.
Its exact meaning can vary by culture, belief system, and legal system. In everyday English, adultery usually refers to cheating on a husband or wife through sexual activity.
It is different from simply having a close friendship or feeling attracted to someone. Some places still treat adultery as a legal matter, while others do not.
Understanding the adultery definition helps explain what the word means and how it is used in different situations.
1. What Is the Adultery Definition?
The basic adultery definition is sexual activity between a married person and someone who is not their spouse.
For example, if a married woman has a sexual relationship with another man, that relationship may be described as adultery. The same applies when a married man has a sexual relationship with someone other than his wife.
The word usually assumes that the person is married. If two unmarried people are dating or having a sexual relationship, the situation is generally not called adultery in the ordinary English sense.
Adultery is often connected with the idea of breaking marital trust. Marriage can involve promises of love, loyalty, and commitment. When one partner has a sexual relationship outside the marriage, people may describe that act as a betrayal of those promises.
However, relationships are not all structured in the same way. Some couples have agreements that allow relationships outside the marriage. In those cases, whether an act is considered a breach of the relationship depends on the couple’s agreement and the meaning they give to marriage.
2. What Does Adultery Mean in Simple Words?
In simple words, adultery means cheating on your spouse by having sex with another person.
Here is an easy example:
John is married to Sarah. John secretly has a sexual relationship with another person. This can be described as adultery.
Another example:
Maria is married but has a sexual relationship with someone who is not her husband. This is commonly called adultery.
The important parts are usually:
- The person is married.
- There is a sexual relationship.
- The other person is not the person’s spouse.
- The relationship may violate the couple’s expectations of marital faithfulness.
The term is more specific than the general word cheating. Cheating can describe many forms of relationship betrayal, while adultery traditionally refers to sexual relations involving a married person.
3. Adultery vs. Cheating: What Is the Difference?
Adultery and cheating are closely related, but they are not always identical.
Cheating is a broad everyday term. It can include kissing, sexual activity, secret romantic relationships, or other behavior that violates a couple’s agreement.
Adultery has a more specific traditional meaning. It normally involves a married person having sexual relations with someone other than their spouse.
| Term | General meaning | Usually involves marriage? |
|---|---|---|
| Adultery | Sexual relationship outside a marriage | Yes |
| Cheating | Breaking a relationship’s trust or agreement | Not always |
| Infidelity | Being unfaithful to a romantic partner | Not always |
| Affair | A secret romantic or sexual relationship | Often, but not always |
For example, an unmarried person who secretly dates another person may be accused of cheating, but the word adultery would usually not be appropriate.
The terms can overlap. A married person’s secret sexual affair can be described as cheating, infidelity, or adultery, depending on the context.
4. Is Adultery the Same as Infidelity?
Adultery and infidelity are similar, but infidelity is the broader term.
Infidelity means being unfaithful to a romantic partner. It can happen in marriage or in other committed relationships.
Adultery traditionally refers specifically to sexual relations involving someone who is married.
For example, imagine two unmarried people who agree to be exclusive. One secretly begins a sexual relationship with another person. This can be called infidelity, even though it is not normally called adultery.
Now imagine one of them is married. The same type of sexual relationship may be described as adultery.
This difference matters when choosing the right word. If you are talking about marriage specifically, adultery is often the more precise term.
5. What Are Common Examples of Adultery?
Examples can make the meaning easier to understand.
Example 1: Secret sexual relationship
A married person secretly has a sexual relationship with another person. This is a traditional example of adultery.
Example 2: Ongoing affair
A married person regularly meets someone else for a romantic and sexual relationship while keeping it hidden from their spouse. This may be called an extramarital affair or adultery.
Example 3: One-time sexual encounter
Adultery does not necessarily require a long-term relationship. In ordinary usage, a married person’s sexual encounter with someone other than their spouse may also be described as adultery.
Example 4: Open marriage
A married couple agrees that both partners may have sexual relationships with other people. In this situation, the behavior may not be considered cheating by the couple because it does not break their agreement. Whether it fits a particular legal or religious definition is a separate question.
These examples show why context matters when using the word.
6. What Is an Extramarital Affair?
An extramarital affair is a romantic or sexual relationship involving a married person and someone outside the marriage.
The word “extramarital” simply means outside marriage.
An affair may be short or may continue for months or years. It can involve emotional attachment, sexual activity, secrecy, or several of these elements.
For example:
A married person secretly develops a romantic and sexual relationship with a coworker.
People may call this an extramarital affair and, when sexual relations are involved, may also describe it as adultery.
However, an affair does not always have exactly the same meaning as adultery. “Affair” can be used more broadly for a secret romantic relationship, while adultery traditionally focuses on the sexual relationship and marital status.
7. Is Adultery a Crime?
Whether adultery is a crime depends on the country and its current laws.
Some legal systems have historically treated adultery as a criminal offense. Other places have removed such laws or do not enforce adultery as a crime.
Adultery can also matter in family law without being a criminal offense. Depending on the jurisdiction, evidence of an affair may have a role in divorce proceedings, separation disputes, or other family-law questions.
Because laws change and differ between jurisdictions, it is important not to assume that the same legal definition applies everywhere.
If you are asking whether adultery is illegal, check the law that applies to your country, state, or province and the relevant current legal rules.
The legal meaning can also be narrower than the everyday meaning. A court may require specific evidence or conditions before treating conduct as legally relevant.
8. Adultery in Religion and Culture
The meaning of adultery also appears in religious and cultural traditions.
Many religious traditions place strong importance on marriage, sexual behavior, and marital faithfulness. Adultery may therefore be viewed as a serious moral or religious violation.
However, different religions and denominations may define sexual misconduct in different ways. Some traditions distinguish between thoughts, intentions, emotional relationships, and physical acts, while others place different emphasis on each.
Culture can also shape how people understand adultery. In one community, the word may be strongly connected to religious morality. In another, it may mainly describe a relationship issue.
For this reason, it is useful to separate three questions:
- What does the word mean in everyday English?
- What does a particular religion teach about it?
- What does the local law say about it?
These questions can have different answers.
9. Adultery in Everyday English
The word adultery is more formal than “cheating.”
You are more likely to see it in books, news reports, legal discussions, religious writing, or serious conversations about marriage.
Here are some natural examples:
- “The couple separated after his adultery became known.”
- “The novel explores jealousy, marriage, and adultery.”
- “The law regarding adultery differs from one jurisdiction to another.”
- “The religious teaching discusses the consequences of adultery.”
In casual conversation, people often say “cheating on their spouse” instead.
For example:
“He cheated on his wife.”
This is usually more natural in everyday speech than:
“He committed adultery.”
Both can communicate a similar idea, but they have different tones.
10. Related Words and Common Misunderstandings
Several words are connected to adultery, but they should not always be treated as exact synonyms.
Adulterer means a person who commits adultery. Traditionally, it can refer to a married person who has sexual relations outside marriage.
Adulteress is an older term for a woman who commits adultery. It is now often considered outdated or unnecessarily gendered, so person who commits adultery or unfaithful spouse may be more suitable.
Infidelity means unfaithfulness in a romantic relationship and is broader than adultery.
Extramarital means something that occurs outside marriage.
Affair usually means a secret romantic or sexual relationship, often involving a married person.
One common misunderstanding is that every form of romantic interest outside marriage automatically equals adultery. Traditionally, the term specifically concerns sexual relations, although religious, cultural, and personal definitions may be broader.
Another misunderstanding is that adultery always means a crime. That is not true everywhere. The legal status of adultery varies by jurisdiction.
FAQs
What is the simple definition of adultery?
Adultery is traditionally defined as a married person having sexual relations with someone who is not their spouse.
Is adultery the same as cheating?
They can mean similar things, but cheating is broader. Cheating can involve different forms of relationship betrayal, while adultery traditionally refers to sexual relations outside marriage.
Can an unmarried person commit adultery?
In the traditional meaning, adultery involves marriage. An unmarried person’s unfaithful behavior may instead be called cheating or infidelity.
Is kissing considered adultery?
A kiss is not normally enough to meet the traditional definition of adultery, which refers to sexual relations. However, couples and religious traditions may have broader ideas about what counts as unfaithful behavior.
Is an emotional affair adultery?
An emotional affair can involve a strong secret romantic attachment without sexual activity. It may be considered infidelity, but it does not always meet the traditional definition of adultery.
Is adultery illegal?
It depends on the jurisdiction. Some places have laws concerning adultery, while others do not treat it as a criminal offense. Local law should be checked for a current answer.
What is another word for adultery?
Related words include infidelity, marital unfaithfulness, extramarital relationship, and affair. These words are related but can have slightly different meanings.
Conclusion
The adultery definition is generally understood as a married person’s sexual relationship with someone other than their spouse.
The word is closely linked with infidelity, marriage, trust, religion, culture, and law. Its exact legal or religious meaning can vary, so context matters. In everyday English, however, the basic idea is simple:
adultery traditionally describes sexual unfaithfulness within a marriage.
I am Elina James, a passionate wordplay lover and the creative mind behind PunzMagic. I enjoy turning simple words into clever puns that make people smile, laugh, and share joy with others.
