purification - definition and synonyms

noun [uncountable] 

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/ˌpjʊərɪfɪˈkeɪʃ(ə)n/
  1. 1
    the process of making something clean by removing dirty or harmful substances from it

    water purification

  2. 2
    a religious act or ceremony to purify someone or something
    purification of:

    the Feast of the Purification of the Temple