Seventieth \Sev"en*ti*eth\, a. [AS. hund-seofontigo[eth]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.

Source: Webster's Revised Unabridged Dictionary (1913)
 

Seventieth \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.

Source: Webster's Revised Unabridged Dictionary (1913)