IPA: /ˌsɛrəˈmoʊniəl/
KK: /sɛrəˈmoʊniəl/
Relating to or used in formal events or ceremonies, often involving specific rituals or traditions.
The ceremonial dress was worn by the participants during the festival.
A formal event or series of actions that are performed on special occasions, often following specific traditions or rituals.
The graduation ceremony was a ceremonial event filled with speeches and celebrations.
Ceremonial is formed from "ceremonia" (meaning a rite or formal act) and the suffix "-al" (meaning pertaining to). The word refers to something that pertains to or is characteristic of a ceremony.
Think of 'ceremony' as a formal act, and remember that 'ceremonial' means related to that formal act.