n.1 the sister of one's father or mother.
2 an uncle's wife.
3 colloq. an unrelated woman friend of a child or children.
Phrases and idioms:
Aunt Sally
1. a game in which players throw sticks or balls at a wooden dummy.
2 the object of an unreasonable attack. my (or my sainted etc.) aunt sl. an exclamation of surprise, disbelief, etc.
Etymology: ME f. AF aunte, OF ante, f. L amita