I. | ̷ ̷ ̷ ̷| ̷ ̷ adjective
1. : being number 64 in a countable series
the sixty-fourth day
— see number table
2. : being one of 64 equal parts into which something is divisible
a sixty-fourth share of the money
II. noun
1. : number 64 in a countable series
2. : the quotient of a unit divided by 64 : one of 64 equal parts of something
one sixty-fourth of the total