Number that makes it possible to determine the position of someone or something in a given context.

Non zero whole-number that indicates the place occupied by an element in a set when the elements are arranged in a certain order.

### Notation

To represent an ordinal number, we use a numerical adjective: *first*, *second*, *third*, *fourth*, etc.

### Example

- Julie finished 5
^{th}in the 100-metre race at school. - The person in blue is 4
^{th}in this line. The person in pink is 11^{th}in this line.

- The number 18 is the 3
^{rd}number in this sequence: 13, 15, 18, 21, 24, 27, 30. - The tenth letter of the alphabet is the letter J.