Etymology
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dad (n.)

"a father, papa," recorded from c. 1500, but probably much older, from child's speech, nearly universal and probably prehistoric (compare Welsh tad, Irish daid, Lithuanian tėtė, Sanskrit tatah, Czech tata, Latin tata "father," Greek tata, used by youths to their elders). Compare papa.

updated on June 24, 2018

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Definitions of dad from WordNet

dad (n.)
an informal term for a father; probably derived from baby talk;
Synonyms: dada / daddy / pa / papa / pappa / pop
From wordnet.princeton.edu, not affiliated with etymonline.