Look up aunt in Wiktionary, the free dictionary.
An aunt is a person who is the sister or sister-in-law of a parent.
A great-aunt (sometimes called a grand-aunt) is the sister or sister-in-law of a grandparent.
The male equivalent of an aunt is an uncle, and the reciprocal relationship is that of a nephew or niece.
"Aunt" (or "auntie") may also be an honorific bestowed upon an individual of fictive kinship.