GNU Collaborative International Dictionary of English

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Found one definition

1.       
   alphanumerical adj.
   1. of or pertaining to alphanumerics.
   
   Syn. -- alphanumeric, alphameric, alphamerical
   
   [WordNet 1.5]
   
   
   2.  (Computers) using or consisting of only alphabetical and numerical characters; -- contrasting with binary or control. alphanumeric characters
   
   Syn. -- alphanumeric, alphanumerical, alphameric, alphamerical
   
   [PJC]