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Synonyms

father-in-law

American  
[fah-ther-in-law] / ˈfɑ ðər ɪnˌlɔ /

noun

  • fathers-in-law
    plural
  1. the father of one's spouse.


father-in-law British  

noun

  1. the father of one's wife or husband

"Collins English Dictionary — Complete & Unabridged" 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012

Other Word Forms

Noun Inflected Forms

Etymology

Origin of father-in-law

First recorded in 1350–1400; Middle English fader in lawe; see origin at father, in, law 1; from Middle English in-lawe “in law,” i.e., “a person within the regulation and protection of the law,” based on the prohibition by Roman civil law and, later, Christian canon law, of marriages within four degrees of consanguinity, i.e., up to and including first cousins

Example Sentences

Examples are provided to illustrate real-world usage of words in context. Any opinions expressed do not reflect the views of Dictionary.com.

See Examples For:

But Joe said he thought his late father-in-law would have been on board with the plan.

From BBC Aug. 8, 2026

But hours later, Republican Senator Bernie Moreno -- Emily Moreno's father and Miller's former father-in-law -- publicly called for him to leave Congress.

From Barron's Aug. 3, 2026

At one point, he accused his former father-in-law, the senator, of continuing “to fund and enable his daughter’s malicious campaign to ruin my life despite his knowledge of her mental health issues.”

From Slate Aug. 1, 2026

Prieto wasn’t entirely surprised her father-in-law landed the 30-pounder because she said he’s very dedicated to the sport.

From Los Angeles Times Aug. 1, 2026

In the afternoon he would go have coffee with José Arcadio and Rebeca, who had begun to put their house in order, and from seven o'clock on he would play dominoes with his father-in-law.

From "One Hundred Years of Solitude" by Gabriel Garcia Marquez

Fathers, fathers-in-law, and brothers of current Royals players and staff travel with the group.

From Washington Times Jun. 6, 2023

Each of the sons’ fathers-in-law also had accounts at the bank worth millions of dollars, as did other businessmen linked to the Mubaraks, whom Egyptian authorities tried on corruption charges.

From Seattle Times Feb. 21, 2022

About 35 to 40 percent of Purush Spandana will be purchased by women, who hope that by casually leaving a copy around the house, their husbands, fathers-in-law or sons may give it a glance.

From New York Times Nov. 12, 2012

And Paul finally realizes that his office/apartment/mole cave of blurry boundaries, provocative teenagers and angry fathers-in-law from exotic complicated countries, does not, right now, feel like the best place to raise a 12-year-old.

From Salon Nov. 24, 2010

To bestow upon Arthur a wife with two such fathers-in-law, as the two worthies whom the guileless and unfortunate Lady Clavering had drawn in her marriage ventures, was to benefit no man.

From The History of Pendennis by Thackeray, William Makepeace

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