I. | ̷ ̷ ̷ ̷| ̷ ̷ adjective
1. : being number 63 in a countable series
the sixty-third day
— see number table
2. : being one of 63 equal parts into which something is divisible
a sixty-third share of the money
II. noun
1. : number 63 in a countable series
2. : the quotient of a unit divided by 63 : one of 63 equal parts of something
one sixty-third of the total