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1911 Encyclopedia Britannica
the brother of a person's father or mother, also the husband of one's aunt (i.e. the sister of a father or mother). The French oncle, which appears in Anglo-French as uncle, comes from a Late Latin unculus, a shortened form of the Latin avunculus, a maternal uncle, the brother of one's mother. The word is a diminutive of avus, grandfather. The Latin for a paternal uncle is patruus. " Aunt" comes through the Old French aunte, ante, corrupted into the modern tante, from Latin amita, a father's sister, a paternal aunt, the maternal aunt being called matertera.
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Chisholm, Hugh, General Editor. Entry for 'Uncle'. 1911 Encyclopedia Britanica. https://www.studylight.org/​encyclopedias/​eng/​bri/​u/uncle.html. 1910.