Sĕv'en-ti-eth1, a.
a. [A-S. seofontigōðha, hund-seofontigōðha.]
Sense 1. Next in order after the sixty-ninth; as, a man in the seventieth year of his age.
Sense 2. Constituting or being one of seventy equal parts into which any thing is divided; as, the seventieth part of a thing.