I. | ̷ ̷ ̷ ̷| ̷ ̷ adjective
1. : being number 45 in a countable series
the forty-fifth day
— see number table
2. : being one of 45 equal parts into which something is divisible
a forty-fifth share of the money
II. noun
1. : number 45 in a countable series
2. : the quotient of a unit divided by 45 : one of 45 equal parts of something
one forty-fifth of the total