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DuckCorp Dico

(RFC 2229 compliant dictionary server)
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Found one definition 

  1.                 From WordNet (r) 3.0 (2006):
                

    
                
                  
    atonicity
    n 1: lack of normal muscular tension or tonus [syn: atonicity,
         atony, atonia, amyotonia] [ant: tone, tonicity,
         tonus]