I. | ̷ ̷ ̷ ̷ ̷ ̷| ̷ ̷ adjective
1. : being number 78 in a countable series
the seventy-eighth day
— see number table
2. : being one of 78 equal parts into which something is divisible
a seventy-eighth share of the money
II. noun
1. : number 78 in a countable series
2. : the quotient of a unit divided by 78 : one of 78 equal parts of something
one seventy-eighth of the total