1. 
   Sixty-fourth
   Six`ty-fourth' adjective Constituting or being one of sixty-four equal parts into which a thing is divided. Sixty-fourth note (Mus.) , the sixty- fourth part of a whole note; a hemi-demi-semiquaver.
   Found op http://www.encyclo.co.uk/webster/S/111
   
   
2. 
   sixty-fourth
   64th adjective the ordinal number of sixty-four in counting order
   Found op http://wordnetweb.princeton.edu/perl/webwn?s=sixty-fourth
   
   
3. 
   Sixty-fourth
   • (a.) Constituting or being one of sixty-four equal parts into which a thing is divided.
   Found op http://thinkexist.com/dictionary/meaning/sixty-fourth/
   
   

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