Pronunciation: (siks'tē-fôrth', -fōrth'), [key]
1. next after the sixty-third; being the ordinal number for 64.
2. being one of 64 equal parts.
1. a sixty-fourth part, esp. of one (1/64).
2. the sixty-fourth member of a series.
Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.