Definition of "great-great-grandfather" []

• The father of someone's great-grandparent. (noun)

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• "Then, for the second time that day, he saw the Einheitliche Feldtheorie, written by Albert Einstein, his great-great-grandfather."
• "Michael took special pleasure in reproducing this picture because it showed his great-great-grandfather at the age of twenty-six, only seven years older than he was."
• "Cotton’s great-great-grandfather could not vote as a slave."