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An aunt is a name used in an extended family. An aunt is either a sister of someone's mother or father, or a wife of your uncle. That person is the aunt's nephew (male) or niece (female). An aunt's child is that person's cousin. A grandaunt (or great-aunt) is the sister or sister-in-law of a grandparent.
In many cultures no single word (such as aunt) describes both their parents' sisters. Instead there are two different words to describe a person's relation to their mother's sister and a person's relation to their father's sister. In Latin, for example, a mother's sister is matertera while a father's sister is amita.
- Constance Brittain Bouchard, Those of My Blood: Creating Noble Families in Medieval Francia (Philadelphia : University of Pennsylvania Press, 2001), p. 5.