Definition of hardening noun from the Oxford Advanced Learner's Dictionary

     

    hardening

     noun
    noun
    BrE BrE//ˈhɑːdnɪŋ//
     
    ; NAmE NAmE//ˈhɑːrdnɪŋ//
     
    [uncountable, singular]
     
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  1. 1the process of becoming or making something become firm, stiff or solid hardening of the arteries
  2. 2the process of becoming less kind or more fixed and determined a hardening of attitudes towards one-parent families Sandra answered with a sudden hardening of her tone. The sufferings of 1914–1918 led to a hardening of hearts.

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