• (n.) Strong attachment to ecclesiastical usages, forms, etc.
Ec·cle`si·as'ti·cism noun Strong attachment to ecclesiastical usages, forms, etc. 
[n] - religion appropriate to a church and to ecclesiastical principles and practices 2. [n] - excessive adherence to ecclesiastical forms and activities
ecclesiasticism 1. Excessive adherence to ecclesiastical forms and activities. 2. Religion appropriate to a church and to ecclesiastical principles and practices. 3. Ecclesiastical principles, practices, or spirit. 4. Devotion; especially, excessive devotion or adherence to the principles, forms, or interests of a church.
noun excessive adherence to ecclesiastical forms and activities; `their ecclesiasticism overwhelmed their religion`