from The American Heritage® Dictionary of the English Language, 4th Edition
- n. The father of one's mother or father.
- n. A forefather; an ancestor.
- transitive v. To exempt (one involved in an activity or business) from new regulations: The new ordinance restricts the size of billboards, but it grandfathers those erected before 1997.
from Wiktionary, Creative Commons Attribution/Share-Alike License
- n. A father of someone’s parent.
- n. A male forefather.
- v. To retain existing laws or rules only for those people or organisations that were previously affected by them, and apply new laws or rules to the unaffected people or organisations.
from the GNU version of the Collaborative International Dictionary of English
- n. A father's or mother's father; an ancestor immediately after the father or mother in lineal ascent.
from The Century Dictionary and Cyclopedia
- n. A father's or mother's father; an ancestor in the next degree above the father or mother in lineal ascent: correlative to grandson, granddaughter, and grandchild.
from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.
- n. the father of your father or mother
V., from grandfather clause.(American Heritage® Dictionary of the English Language, Fourth Edition)
grand + father (Wiktionary)
From grandfather clause (Wiktionary)