mother-in-law

noun

moth·​er-in-law ˈmə-t͟hər-ən-ˌlȯ 

ˈmət͟h-rən-, 

ˈmə-t͟hərn-

plural mothers-in-law ˈmə-t͟hər-zən-ˌlȯ 

1

: the mother of one's spouse

2

archaic : stepmother

Examples of mother-in-law in a Sentence

Recent Examples on the Web

Remember, the holidays are approaching, and a scented candle makes a lovely present for just about any discerning coworker, the cousin who’s just moved, or your votive-loving mother-in-law. — Kate McGregor, Architectural Digest, 7 Oct. 2026

During the journey, Choi exchanged text messages with her mother-in-law. — Chris Lau, CNN Money, 2 Oct. 2026

Your mother-in-law appears to be solely centered upon herself. — Abigail Van Buren, Mercury News, 25 Sep. 2026

The idea for the business came from owners Sami Totten and her mother-in-law, Deb Totten, who bonded over the centuries old Chinese tile strategy game that has soared in popularity over the last few years. — Noelle Alviz-Gransee, Kansas City Star, 24 Sep. 2026

Word History

First Known Use

14th century, in the meaning defined at sense 1

Rhymes for mother-in-law

• avoirdupois
• aa
• aha
• bashaw
• bradshaw
• byelaw
• bylaw
• chainsaw
• cheraw
• coleslaw
• crenshaw
• dada

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