Dad is an informal word for father. It’s a word like "pop" or "daddy." Some families have two dads, others have none. Sometimes a dad gets a “World’s Greatest Dad” mug on Father’s Day. Well done, sir.

If you’re talking about any ol’ dad, don’t capitalize it. There are dads all over the place. If you’re addressing your own father, basically using Dad as his name, do capitalize the “d.” The word dates from at least 1500, and it's believed to come from childish speech, or baby talk, since a very common first sound made by babies is "da."

Definitions of dad
  1. noun
    an informal term for a father; probably derived from baby talk
    synonyms: dada, daddy, pa, papa, pappa, pop
    see moresee less
    type of:
    begetter, father, male parent
    a male parent (also used as a term of address to your father)
DISCLAIMER: These example sentences appear in various news sources and books to reflect the usage of the word ‘dad'. Views expressed in the examples do not represent the opinion of or its editors. Send us feedback
Word Family

Look up dad for the last time

Close your vocabulary gaps with personalized learning that focuses on teaching the words you need to know.

VocabTrainer -'s Vocabulary Trainer