Definitions of hardening:
  • noun:   the act of making something harder (firmer or tighter or more compact)
  • noun:   the process of becoming hard or solid by cooling or drying or crystallization
    Example: "The hardening of concrete"
  • noun:   abnormal hardening or thickening of tissue

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See hardening used in context: 5 rhymes, 2 Shakespeare works, several books and articles.

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