forty-fifth UK /ˌfɔːti ˈfɪ(f)θ/US /ˌfɔɹti ˈfɪ(f)θ/adjective 1noun 1forms 1 adjective1 •The ordinal form of the number forty-five, describing a person or thing in position number 45 of a sequence.The answer appears on the forty-fifth page of the book.She finished forty-fifth in the race. noun1 •One of forty-five equal parts of a whole.A forty-fifth of 900 is 20. formsforty-fifths
