From Latin 'duodecim' (two + ten) — the grouping reflects 12's mathematical advantage: divisible by 2, 3, 4, and 6.
A group of twelve items.
From Middle English 'dosein,' from Old French 'dozeine' (a group of twelve), from 'doze' (twelve), from Latin 'duodecim' (twelve), a compound of 'duo' (two) and 'decem' (ten). The Latin formation is transparent: 'two-ten' = twelve. The preference for groups of twelve in trade and daily life reflects the practical advantages of the number 12, which is evenly divisible by 2, 3, 4, and 6, making it far more useful for subdivision than the number 10. Key roots
A 'baker's dozen' is 13, not 12. The tradition dates to medieval England, where bakers faced severe penalties for selling underweight bread. To avoid punishment, bakers added an extra loaf to each dozen as insurance. The term is attested from the sixteenth century, and the practice reveals just how seriously medieval authorities