What does A baker's dozen mean?

A baker's dozen meaning in Cooking Dictionary

The "baker's dozen" relates to providing 13 baked things for cost of 12 and originated as a way to prevent shortchanging the customer. Bakers who shorted (cheated) clients could possibly be penalized severely-such as dropping a hand to an axe! This allowed that certain for the 13 might be lost, eaten, burned, or wrecked one way or another, leaving the baker with the initial legal dozen. The rehearse is visible in the Baker Guild codes of Worshipful Company of Bakers in London, twelfth century.