contamination - definition and synonyms

noun [uncountable] 

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/kənˌtæmɪnˈneɪʃ(ə)n/
  1. 1
    the process of making something dirty, polluted, or poisonous by adding a chemical, waste, or infection

    [ex] They are concerned about levels of contamination in our oceans.

  2. 2
    substances that make something dirty, polluted, or poisonous

    This contamination will take centuries to decay.

  3. 3
    the process of affecting someone or something in a negative way

    They wish to avoid what they see as contamination by more liberal societies.