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.
Three hours into the debate, Scott offered an amendment that would change the 8-30g law to include accessory dwelling units, sometimes called mother-in-law apartments, in the calculation to count toward affordable housing. Christopher Keating, Hartford Courant, 28 May 2025 Dear Eric: Several years ago, my mother-in-law passed away due to dementia. R. Eric Thomas, Chicago Tribune, 25 May 2025 Despite going to extra lengths to ensure her mother-in-law knew one of the loaves contained cinnamon, the matriarch still decided to cut herself a slice of the sweet bread. Virginia Chamlee, People.com, 25 May 2025 Yes, even in a cooler for hours on the way to your mother-in-law’s house. Cameron Beall, Southern Living, 25 May 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 4 Jun. 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

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