WordReference Random House Unabridged Dictionary of American English © 2017
great-aunt  (grātant′, -änt′),USA pronunciation n. 
  1. a grandaunt.
  • 1650–60

Collins Concise English Dictionary © HarperCollins Publishers::

great-aunt, grandaunt n
  1. an aunt of one's father or mother; sister of one's grandfather or grandmother

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