일대사인연 (一大事因緣)의 약칭. 가장 중요한 일로 부처님께서 이 세상에 오신 이유

A matter of great importance: A great undertaking such as the account of the Buddha's career. It is a short of (Ildaesainyeon). The great event of Buddha's coming into the mundane world to save sentient beings.