Definition of "aunt"

aunt

/ɑːnt/

noun
plural aunts
1. The sister or sister-in-law of one’s parent.
  Quotations
  As a rule, you see, I'm not lugged into Family Rows. On the occasions when Aunt is calling to Aunt like mastodons bellowing across primeval swamps and Uncle James's letter about Cousin Mabel's peculiar behaviour is being shot round the family circle... the clan has a tendency to ignore me.
  1923, P.G. Wodehouse, The Inimitable Jeeves
2. The female cousin or cousin-in-law of one’s parent.
3. (endearing) A woman of an older generation than oneself, especially a friend of one's parents, by means of fictive kin.
4. (obsolete) Any elderly woman.
5. (obsolete) A procuress or bawd.
  Quotations
  I saw neither hope of his reclaiming, nor comfort in his being; and was it not then better bestowed upon his uncle than upon one of his aunts?—I need not say bawd, for every one knows what aunt stands for in the last translation.
  c. 1605 (first performance; published 1608), Thomas Middleton, “A Trick to Catch the Old One”, in A[rthur] H[enry] Bullen, editor, The Works of Thomas Middleton […] (The English Dramatists), volume II, London: John C. Nimmo […], published 1885, Act II, scene ii, page 267