Sev"en*ti*eth (?), a. [AS. hund-seofontigo&edh;a.]
1.
Next in order after the sixty-ninth; as, a man in the seventieth year of his age.
2.
Constituting or being one of seventy equal parts.
© Webster 1913.
Sev"en*ti*eth, n.
1.
One next in order after the sixty-ninth.
2.
The quotient of a unit divided by seventy; one of seventy equal parts or fractions.
© Webster 1913.