baker's dozen

bak·er's dozen (bkrz)

n.

A group of 13.

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[From the former custom among bakers of adding an extra roll as a safeguard against the possibility of 12 weighing light.]

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baker's dozen

n

(Mathematics & Measurements / Units) thirteen

[from the bakers' former practice of giving thirteen rolls where twelve were requested, to protect themselves against accusations of giving light weight]

Thesaurus

Noun

1.

baker's dozen - the cardinal number that is the sum of twelve and one 13, long dozen, thirteen, XIII large integer - an integer equal to or greater than ten