Definition of ordinal numbers: Numbers that refer to the position rather can say the order of something pertaining to other numbers.

• If suppose we have a list of numbers then the position of the number will be given by the ordinal number or simply ordinal. 

•  The terms like 1st, 2nd, 3rd, 4th, 5th, 6th, etc denote something or someone's position or the order in the list. 

• Thus, you can write “59000th” which indicates an ordinal number.