To make ecclesiastical; to subject to church authority or principles; to convert to a more churchly character.
From 'ecclesiastic' plus the verb suffix '-ize' meaning 'to make' or 'to cause to be'. Creates a dynamic verb describing transformation toward church governance.
To 'ecclesiasticize' something is to church-ify it—imagine taking a secular government structure and slowly converting it to operate under religious rules and clerical oversight!
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