Something that is ceremonial relates to a ceremony or is used in a ceremony.
He represented the nation on ceremonial occasions.
他在礼仪场合代表着国家。
A position, function, or event that is ceremonial is considered to be representative of an institution, but has very little authority or influence.
Up to now the post of president has been largely ceremonial.
到目前为止,总统职位在很大程度上是礼仪性的。