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Definitions of hardening
  1. noun
    the process of becoming hard or solid by cooling or drying or crystallization
    "the hardening of concrete"
  2. noun
    abnormal hardening or thickening of tissue
    type of:
  3. noun
    the act of making something harder (firmer or tighter or more compact)
Examples of hardening
  • "the hardening of concrete"
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