noun
enthronement ceremony; coronation
Refers specifically to the formal ceremony in which a new emperor ascends the throne. In Japan, this is a state occasion with traditional rituals.
新天皇の即位式が皇居で行われた。
The new emperor's enthronement ceremony was held at the Imperial Palace.
戴冠式 is a coronation ceremony in a Western monarchy, involving a crown. 即位式 is the Japanese enthronement ceremony, which does not involve a crown.
Compound of 即位 (enthronement) + 式 (ceremony).