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Ordinal numeral
An ordinal numeral indicates a rank order in a row.
Explanation
Frequently used ordinal numbers include: first, second, third, ... which you usually write as 1st, 2nd, 3rd, ...
Example 1
The general formula for a long division is
The 2nd power gives 2 terms, the 3rd power 3 terms, the 4th power 4 terms, the 8th power 8 terms, and so on.
Example 2
For the 4th power of the root of the imaginary unit applies