fif•ty-threePronunciation: (fif'tē thrē'), [key]
a cardinal number, 50 plus 3.
a symbol for this number, as 53 or LIII.
a set of this many persons or things.
amounting to 53 in number.
Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.