IPA: /ˌsɛrəˈmoʊniəlɪzəm/
KK: /sɛrəˈmoʊniəlɪzəm/
A strong preference or attachment to formal rituals and ceremonies, especially in religious contexts.
The community's ceremonialism was evident in their elaborate festivals and rituals.
Ceremonialism is formed from "ceremonial" (from Latin "caerimonia", meaning a rite or religious observance) and "-ism" (meaning a practice or belief). The word refers to the practice or belief in ceremonies or rituals.
Think of 'ceremonial' as relating to rites or observances, and '-ism' as a practice or belief — so ceremonialism is the practice of engaging in ceremonies.