dad

1 [dad]
noun Informal.

Origin:
1490–1500; probably orig. nursery word

Dictionary.com Unabridged

dad

2 [dad]
interjection Informal.
God (used in combination in mild oaths): dad-blamed; dad-gummed.

Origin:
1670–80; euphemism for God

dad

3 [dad]
noun Scot. and North England.
1.
a solid blow or knock.
2.
a large slice, lump, or portion.

Origin:
1710–20; probably variant of dab1

ḍad

[dahd]
noun
the 15th letter of the Arabic alphabet.

Origin:
< Arabic

Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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Collins
World English Dictionary
dad (dæd)
 
n
an informal word for father
 
[C16: childish word; compare Greek tata, Sanskrit tatas]

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009
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Etymonline
Word Origin & History

dad
recorded from c.1500, but probably much older, from child's speech, nearly universal and probably prehistoric (cf. Welsh tad, Ir. daid, Czech, L., Gk. tata, Lith. tete, Skt. tatah all of the same meaning).
Online Etymology Dictionary, © 2010 Douglas Harper
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American Heritage
Abbreviations & Acronyms
DAD
  1. delayed after depolarization

  2. Dogs Against Drugs

The American Heritage® Abbreviations Dictionary, Third Edition
Copyright © 2005 by Houghton Mifflin Company.
Published by Houghton Mifflin Company. All rights reserved.
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Example sentences
At dinner in a restaurant two years ago, my dad broke some unsettling news to
  my husband and me.
Many college students have bills that mom and dad don't pay.
When mom and dad are both working, a night at the movies might seem grand.
But no one could accuse him of being an absentee dad.
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