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English definition of “grandfather”

grandfather

noun [C] uk   /ˈɡræn.fɑː.ðər/ us    /-ðɚ/ (informal grandpa, grandad)
A2 the father of a person's mother or father: Her grandfather on her mother's side was Italian. [as form of address] formal or old-fashioned Let me help you, Grandfather.
(Definition of grandfather from the Cambridge Advanced Learners Dictionary & Thesaurus © Cambridge University Press)
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