ninth

‘Ninth’ has two meanings:

(1) It can mean one part of nine, which is recorded as a fraction, \dfrac{1}{9}.

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

Susan takes one piece of the cake, therefore she has \dfrac{1}{9}.

(2) It can also mean the number 9 in a sequence of numbers.

It appears after the 8th, but before the 10th.

For example, 10 people are waiting to see the dentist. They have been listed according to the time of their appointment.

Huw is the 9th person on the list.