Baker's dozen

//ˌbeɪkəz ˈdʌzən// noun, slang

Definitions

Noun
  1. 1
    Thirteen; a group of thirteen. idiomatic

    "[L]et him caſt his Eye upon the laſt Page of that Book, where Mr. Blount has tranſlated a Quotation out of Scaliger de Emend. brought by the Author of the Præadamitæ; now he tranſlates Octingenties octagies, not eight hundred and eighty, but eight hundred and eightſcore; as if the Romans had uſed to reckon by ſcores. He might altogether as well, have made them number by Bakers-Dozens."

  2. 2
    A solitaire card game, starting with 13 piles of 4 cards each. uncountable
  3. 3
    the cardinal number that is the sum of twelve and one wordnet
  4. 4
    A cousin. Cockney, slang

    ""Before I agree to help you and your baker's dozen over there …" Rose nodded at Larry. / "It means cousin," Larry said. / "Before I say yes to helping, I would like a low-risk, up-front agreement.""

Etymology

Possibly from the former practice of bakers adding a thirteenth loaf of bread to a batch of twelve loaves in order to avoid punishment for accidentally selling underweight bread.

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