Where does “aunt-in-law” come from?

aunt-in-law (English) comes from English aunt, from Middle English aunte, from Anglo-Norman aunte, from Old French ante, from Latin amita, from Proto-Indo-European amma- — mother.

aunt-in-law (English): The wife of one's uncle or aunt (parent's sibling)

Definitions

  1. The wife of one's uncle or aunt (parent's sibling)

Ancestry of “aunt-in-law”, step by step

aunt-in-law traces back through two separate lines of ancestry.

via English aunt

StepLanguageWordMeaning
1EnglishauntThe sister or sister-in-law of one’s parent; The...
2Middle Englishaunteaunt
3Anglo-NormanaunteLate Anglo-Norman spelling of ante
4Old Frenchantenominative singular of antain; aunt
5Latinamitapaternal aunt; father's sister
6Proto-Indo-Europeanamma-mother

via English in-law

StepLanguageWordMeaning
1Englishin-lawA relative by marriage (or through affinity)
2English-in-lawRelated through marriage
3Englishmother-in-lawThe mother of one's spouse; A mother-in-law...
4Middle Englishmoder in lawemother-in-law
Every word from Proto-Indo-European amma-