DuckCorp Dico

Found one definition

1.                 From WordNet (r) 3.0 (2006):
                   
   
   
                   
                     
   hardening
       n 1: abnormal hardening or thickening of tissue
       2: the process of becoming hard or solid by cooling or drying or
          crystallization; "the hardening of concrete"; "he tested the
          set of the glue" [syn: hardening, solidifying,
          solidification, set, curing]
       3: the act of making something harder (firmer or tighter or more
          compact)