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Definition of grandfather

grandfather

/ˈɡrændˌfɑːðər/
grand · fa · ther

Plural:grandfathers
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Adjective:grandfatherly
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Past Simple:grandfathered
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Past Participle:grandfathered
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Present Participle:grandfathering
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grandfather Lexical Profile

grandfather Game Scores & Validity

• noun

1

The father of one's father or mother.

Example

"Every summer, we spent two weeks at my grandfather's farmhouse in the countryside."


2

A male ancestor, forefather, or originator of a movement, field, or tradition.

Example

"He is widely regarded as the grandfather of modern computer science."

Synonyms
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Antonyms
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• verb

1

North American To exempt an existing person, business, or practice from a newly enacted law or regulation (often used with 'in').

Example

"Existing subscribers were grandfathered in at their original monthly rate when the company raised prices."

Synonyms
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Word Origin & Etymology

First recorded in the early 15th century, formed from 'grand-' (borrowed from Anglo-French 'graund', used in kinship terms to denote one generation older) and 'father' (from Old English 'fæder'), gradually replacing the older native English term 'eam' or 'eld-father'.

Cite this Entry


Wordmom. (2026). Definition of Grandfather. In Wordmom Dictionary. Retrieved Nov 5, 2026, from https://wordmom.com/dictionary/grandfather
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