noun
the cardinal number that is the sum of twelve and one
• Syn: ↑thirteen, ↑13, ↑XIII, ↑long dozen
• Hypernyms: ↑large integer
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noun [singular]
old-fashioned : thirteen of something
a baker's dozen of books [=thirteen books]
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a group of thirteen (= one more than a dozen, which is twelve) This phrase comes from bakers' old custom of adding one extra loaf to an order of a dozen.
Useful english dictionary. 2012.