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A group of 13.
[From the former custom among bakers of adding an extra roll as a safeguard against the possibility of 12 weighing light.]
[C16: from the bakers' former practice of giving thirteen rolls where twelve were requested, to protect themselves against accusations of giving light weight]
a group of 13; a dozen plus one.
1. Thirteen items; from a former practice by bakers of giving a free thirteenth roll or loaf to a customer who bought a dozen.
2. An amount of 13.