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grandpa

[gran-pah, -paw, grand-, gram-, gram-puh]
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noun Informal.
  1. grandfather.

Origin of grandpa

First recorded in 1885–90; grand- + pa
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018

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British Dictionary definitions for grandpa

grandpa

grandpapa (ˈɡrænpəˌpɑː, ˈɡrænd-)

noun
  1. informal words for grandfather
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012

Word Origin and History for grandpa

n.

1814, childish or familiar form of grandfather (see pa). Grandpappa is recorded from 1753, grandpop from 1860, grandpappy from 1853.

Online Etymology Dictionary, © 2010 Douglas Harper