mother-in-law

noun

moth·​er-in-law ˈmə-t͟hər-ən-ˌlȯ How to pronounce mother-in-law (audio)
ˈmət͟h-rən-
ˈmə-t͟hərn-
plural mothers-in-law ˈmə-t͟hər-zən-ˌlȯ How to pronounce mother-in-law (audio)
1
: the mother of one's spouse
2
archaic : stepmother

Examples of mother-in-law in a Sentence

Recent Examples on the Web
Examples are automatically compiled from online sources to show current usage. Read More Opinions expressed in the examples do not represent those of Merriam-Webster or its editors. Send us feedback.
Among the planning was a unique request for her future mother-in-law. Bailey Richards, PEOPLE, 29 Dec. 2025 After the bride opted not to wear one of her mother-in-law’s designs, relations reportedly chilled, and now the situation has gotten even frostier, with Brooklyn unfollowing the InterMiami co-owner and ex pop star on social media. Madeleine Marr, Miami Herald, 27 Dec. 2025 His mother-in-law was visiting at the time of the shooting, according to the Daily Mail. Stepheny Price, FOXNews.com, 26 Dec. 2025 My wife began to develop a feeling of abandonment from someone who was supposed to be her mother-in-law. R. Eric Thomas, Mercury News, 25 Dec. 2025 See All Example Sentences for mother-in-law

Word History

First Known Use

14th century, in the meaning defined at sense 1

Time Traveler
The first known use of mother-in-law was in the 14th century

Cite this Entry

“Mother-in-law.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/mother-in-law. Accessed 29 Dec. 2025.

Kids Definition

mother-in-law

noun
moth·​er-in-law
ˈmət͟h-(ə-)rən-ˌlȯ
ˈmət͟h-ərn-ˌlȯ
plural mothers-in-law
ˈmət͟h-ər-zən-
: the mother of one's husband or wife

More from Merriam-Webster on mother-in-law

Last Updated: - Updated example sentences
Love words? Need even more definitions?

Subscribe to America's largest dictionary and get thousands more definitions and advanced search—ad free!