I. ˈsevən]tēə̇th, -v ə m], ˈseb ə m], ]dē- adjective
Etymology: Middle English seventithe, from Old English hund seofontigotha, from hund seofontig seventy + -otha, -tha -th — more at seventy
1. : being number 70 in a countable series
the seventieth day
— see number table
2. : being one of 70 equal parts into which something is divisible
a seventieth share of the money
II. noun
( -s )
1. : number 70 in a countable series
2. : the quotient of a unit divided by 70 : one of 70 equal parts of something
one seventieth of the total