academic year n (annual teaching period) 学年 all-year adj (lasting the whole year) 整年的，全年的 calendar year n (365 days: 1 January to 31 December) 一年，日历年...
The students return in October for the start of the new academicyear.
学生于十月返校，开始新学年的学习。
《牛津词典》
2
Most universities host welcome events before the academicyear officially begins, including freshmen orientations, campus picnics, and entertainments like concerts.
学年正式开始前，大多数大学都会举办欢迎活动，包括迎新会、校园野餐会、和音乐会等娱乐活动。
3
As a rule, our academicyear begins early in September.