baker's dozenbak·er's dozen
A baker's dozen cookies.
The definition of baker's dozen is thirteen, or one more than a dozen.
An example of a baker's dozen is a box of thirteen donuts.
a group of thirteen: supposedly from bakers' former practice of adding an extra roll to each dozen sold to avoid any risk of penalty for short measure
A group of 13.
Origin of baker's dozenFrom the former custom among bakers of adding an extra roll as a safeguard against the possibility of 12 weighing light
(plural baker's dozens)