twelfth

‘Twelfth’ has two meanings:

(1) It can mean one part of twelve, which is recorded as a fraction, \dfrac1{12}.

For example, the picture opposite shows a cake which has been divided into twelve equal pieces.

Salma takes one piece of the cake, therefore she has \dfrac1{12}.

(2) It can also mean the number 12 in a sequence of numbers.

It appears after the 11th, but before the 13th.

For example, 13 people are waiting to see the dentist. They have been listed according to the time of their appointment.

Salma is the 12th person on the list.