I. | ̷ ̷ ̷ ̷| ̷ ̷ adjective
1. : being number 28 in a countable series
the twenty-eighth day
— see number table
2. : being one of 28 equal parts into which something is divisible
a twenty-eighth share of the money
II. noun
1. : number 28 in a countable series
the twenty-eighth of the month
2. : the quotient of a unit divided by 28 : one of 28 equal parts of something
one twenty-eighth of the total