Etymology
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tad (n.)

1877, "young or small child," probably a shortened form of tadpole, which is said to be the source of Tad as the nickname of U.S. President Lincoln's son Thomas (1853–1871). The extended meaning "small amount" is first recorded 1915.

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Definitions of tad

tad (n.)
a slight amount or degree of difference;
not a tad of difference
a tad too expensive
Synonyms: shade
From wordnet.princeton.edu