secularization

/S EH1 K Y AH0 L ER0 IH0 Z EY1 SH AH0 N/
noun
  1. 1

    The transformation of a society from close identification with religious values and institutions toward non-religious (or "irreligious") values and secular institutions.

  2. 2

    The deconsecration of a church.

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Source: https://en.wiktionary.org/wiki/secularization