extramarital

adjective

ex·​tra·​mar·​i·​tal ˌek-strə-ˈmer-ə-tᵊl 

-ˈma-rə-

: of, relating to, or being sexual intercourse between a married person and someone who is not that person's spouse : adulterous

an extramarital affair

Synonyms of extramarital

• adulterous
• extracurricular

Examples of extramarital in a Sentence

she had several extramarital affairs with coworkers

Recent Examples on the Web

In a series of emails from 2013 Epstein sent to himself, Epstein appeared to suggest that Bill Gates was having an extramarital affair and seeking illicit drugs. —Matt Lavietes, NBC news, 3 Feb. 2026

Banfield was having an extramarital affair with the au pair at the time. —Lauren Del Valle, CNN Money, 29 Jan. 2026

Later novels routinely took inspiration from family members or former or current lovers; the 1980 novel that baffled Frank Kermode is a dreamlike fable about a man guiltily trying to have an extramarital affair. —Christopher Tayler, Harpers Magazine, 27 Jan. 2026

The couple embarked on an extramarital affair before eventually divorcing their respective spouses and marrying in 2006. —Christine Pelisek, PEOPLE, 10 Jan. 2026

Word History

First Known Use

1925, in the meaning defined above

Rhymes for extramarital

• marital
• nonmarital
• premarital

Kids Definition

extramarital

adjective

ex·​tra·​mar·​i·​tal ˌek-strə-ˈmar-ət-ᵊl 

: of or relating to sexual intercourse between a married person and someone other than his or her spouse