Meaning of “grandfather” in the English Dictionary

american-english dictionary

"grandfather" in British English

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grandfathernoun [ C ]

uk /ˈɡræn.fɑː.ðər/ us /ˈɡræn.fɑː.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.

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(Definition of “grandfather” from the Cambridge Advanced Learner’s Dictionary & Thesaurus © Cambridge University Press)

"grandfather" in American English

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grandfathernoun [ C ]

us /ˈɡrændˌfɑð·ər/ infml granddad, /ˈɡræn·dæd/ , infml grandpa, /ˈɡræm·pə, -pɑ/

the father of a person’s mother or father

(Definition of “grandfather” from the Cambridge Academic Content Dictionary © Cambridge University Press)