Definition of grandpa noun from the Oxford Advanced Learner's Dictionary

 

grandpa

 noun
noun
BrE BrE//ˈɡrænpɑː//
 
; NAmE NAmE//ˈɡrænpɑː//
 
(informal) Relations
 
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grandfather grandma and grandpa see also grandad See related entries: Relations
See the Oxford Advanced American Dictionary entry: grandpa