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what is mean by baker dozen?

Meaning: Thirteen or, more rarely, fourteen.

A regular dozen is twelve, but a baker's dozen is 13.

Years ago in England there were strict penalties for those who gave short weight. During this era, Bakers were usually not educated and terrible counters. So to avoid any penalties, the bakers would give 13 instead of 12 or a dozen, just in case they miscalculated.