dad Meaning, Definition & Usage

  1. noun an informal term for a father; probably derived from baby talk
    dada; papa; pop; pappa; pa; daddy.

WordNet


Dad noun
Etymology
Prob. of Celtic origin; cf. Ir. daid, Gael. daidein, W. tad, OL. , , Skr. tata.
Definitions
  1. Father; -- a word sometimes used by children.
    I was never so bethumped withwords, Since I first called my brother's father dad. Shak.

Webster 1913