Definition of 一大事 (いちだいじ)
いちだいじ
                        一大事
いちだいじ
ichidaiji
Common word
noun
•
        
important matter, matter of great importance, serious affair, major incident, emergency
Related Kanji
| 一 | one, one radical (no.1) | 
| 大 | large, big | 
| 事 | matter, thing, fact, business, reason, possibly |