This is the 982nd most frequent Korean word.
년
The Korean word "년" means "year."
Here, '년' is used as a measure word to indicate the span of years.
저는 지난 5년 동안 공부했습니다.
I have studied for the past 5 years.
'년' is used here to specify a particular year when an event occurred.
그 사건은 이천년(2000년)에 발생했습니다.
That event happened in the year 2000.
In this context, '년' is part of the word '새해', meaning 'new year', referring specifically to the beginning of the year.