This is the 7590th most frequent Japanese word.
初年
"初年" means "the first year."
The word 初年 is used here to indicate the 'first year' of a specific period.
初年には多くの新しいことを学びました。
In the first year, I learned many new things.
初年 refers to the 'first year' since the company's establishment or operation began.
会社の初年は特に忙しかったです。
The company's first year was particularly busy.
初年 is applied to describe the 'first year' within the context of someone's career.