Seventieth (adjective)

Coming after sixty-ninth and before seventy-first in a countable series.

Origin:

From seventieth ("the ordinal form of the number seventy") + -th.

Examples:

1. He was the seventieth person to cross the finish line.
2. The seventieth anniversary of the founding of the company was celebrated with a grand banquet.
3. The seventieth floor of the building was the highest.
4. The seventieth day of the year is March 11th.
5. He was the seventieth president of the country.