noun
April
The fourth month of the Gregorian calendar; the start of the fiscal and academic year in Japan.
日本では四月に入学式があります。
In Japan, entrance ceremonies are held in April.
noun
fourth month of the lunar calendar
Historical or traditional use; roughly corresponds to May in the modern calendar. Rare in everyday conversation.
旧暦の四月は、今の五月ごろにあたります。
The fourth month of the old lunar calendar corresponds to around May now.