Language in the United States
The words used for fornication, adultery and infidelity, where they come from and how their meaning shifted.
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What Fornication Means: Everyday, Legal and Biblical Definitions
Fornication means consensual sexual intercourse between two people who are not married to each other. Merriam-Webster traces the English word to the 14th century. In US law it named a misdemeanor, still listed in a few state codes, and in the King James Bible it translates the Greek porneia, a broader term for sexual immorality.
View the topic →From Roman Arches to Sin: The Origin of the Word Fornication
Fornication comes from Late Latin fornicatio, built on fornicari, itself from Latin fornix, an arch or vaulted chamber. In writers such as Horace and Juvenal, fornix came to mean a brothel, possibly because prostitutes worked under arches. The word reached English around 1300 through Old French fornicacion.
View the topic →Fornication or Adultery? How the Two Words Differ
Adultery is sex in which at least one partner is married to someone else; fornication is sex between people not married to each other. South Carolina's code still draws exactly that line. Some older laws turned on the woman's status alone. In the King James Bible, fornication can also be a wider term covering adultery.
View the topic →Fornicators and Whoremongers: Old Words in the King James Bible
In the King James Bible, "fornicator" and "whoremonger" both translate the Greek pornos, used ten times in the New Testament and split evenly between the two English words. The term first meant a male prostitute, then anyone engaging in unlawful sexual intercourse. Hebrews 13:4 warns that God will judge "whoremongers and adulterers."
View the topic →Why Modern Bibles Say "Sexual Immorality" Instead of Fornication
Both render the Greek porneia, which the King James Version translates as "fornication" 26 times. Lexicons define porneia broadly as illicit sexual intercourse, including adultery and incest, and figuratively idolatry. Translations such as the NIV prefer "sexual immorality" to capture that range, as in "flee from sexual immorality" at 1 Corinthians 6:18.
View the topic →What "Living in Sin" Means and Why the Phrase Is Fading
"Living in sin" is an old-fashioned phrase, Merriam-Webster says, for a couple who live together and have sex without being married. It reflects Christian teaching that sex belongs within marriage and echoes old state laws against cohabitation. The phrase has faded as attitudes shifted: in 2019, 69% of Americans accepted unmarried cohabitation.
View the topic →Debunked: "Fornication Under Consent of the King"
No. The acronym story is a modern invention. Etymonline calls acronym explanations of the f-word an "unkillable urban legend" traceable online to 1995. The word is attested in English long before such acronyms were fashionable, with the spelling fukkit in 1503. Fornication itself comes from Latin fornix, an arch.
View the topic →Shotgun Weddings: Meaning and History of an American Expression
A shotgun wedding is a marriage that takes place because the bride is pregnant and the couple feels pressed to marry; Merriam-Webster dates this sense to 1929. The custom has faded as births outside marriage became common: in 2024, 39.5% of US births were to unmarried women, according to the CDC.
View the topic →From "Fornication" to "Premarital Sex": How American Vocabulary Changed
Largely, yes. Cornell's Legal Information Institute notes that what statutes call fornication is now more commonly called premarital sex. The difference is tone: fornication carries legal and biblical weight, while premarital sex is neutral. Surveys follow suit; Gallup asks whether sex between an unmarried man and woman is morally acceptable.
View the topic →"Lewd and Lascivious" and Other Legal Terms in Old Sex Statutes
The phrase comes from statutes such as North Carolina's 1805 law, which punishes an unmarried man and woman who "lewdly and lasciviously associate, bed and cohabit together." Mississippi speaks of unlawful cohabitation, and South Carolina of habitual carnal intercourse. The statutes target an ongoing sexual relationship rather than shared housing; North Carolina's does not reach platonic roommates.
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