for•ty-fifthPronunciation: (fôr'tē fifth' or, often, -fith'), [key]
next after the forty-fourth; being the ordinal number for 45.
being one of 45 equal parts.
a forty-fifth part, esp. of one (1/45
the forty-fifth member of a series.
Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.