Etymology
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grandpa (n.)

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

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Definitions of grandpa

grandpa (n.)
the father of your father or mother;
Synonyms: grandfather / gramps / granddad / grandad / granddaddy
From wordnet.princeton.edu