1To enroll or be admitted to a school, university, or other educational institution as a new student (e.g. matriculation). In Japan, entrance ceremonies typically take place in April.
来年、娘は小学校に入学する。
Next year, my daughter will start elementary school.
入学式は4月の初めに行われた。
The entrance ceremony was held in early April.
大学に入学してから、一人暮らしを始めた。
After enrolling in university, I started living on my own.