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grandfather
A grandfather is the parent of either your mother or your father. (noun)
An example of a grandfather is your mom's dad.
To grandfather is allow someone to continue to abide by old rules, even when new ones are passed. (verb)
An example of grandfather is when a town changes its zoning rules but allows a home to remain residential even though the area has been changed to commercial.
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See grandfather in Webster's New World College Dictionary
See grandfather in American Heritage Dictionary 4
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