# in-law

> English word · Noun

## Definitions
1. A relative by marriage (or through affinity).
2. Sometimes specifically a parent-in-law of one's child, for which the dedicated terms co-mother-in-law, co-father-in-law are rare.

## Etymology
Back-formation from -in-law.

## Source
Compiled from Wiktionary via kaikki.org (CC BY-SA). Data vintage: 2026-05-06.
Canonical page: https://plainspell.com/en/word/in-law