secularization

• secularisation (non-Oxford British English)

From secular +‎ -ization.

• (General American) IPA^(key): /ˈsɛkjəlɚaɪˌzeɪʃən/

• Audio (US):

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secularization (countable and uncountable, plural secularizations) (American spelling, Oxford British English)

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

• deconfessionalization, deconsecration, desacralization, laicization

• desecularization