N2
いよいよ
At last, Finally, More and more
いよいよ明日で卒業か...。
Tomorrow is finally our graduation, isn't it…
Explanation
「いよいよ」 has 2 uses
1At last
After a long wait, the big moment is finally here, with excitement and nerves: 「いよいよ明日出発だ」 (we finally leave tomorrow).
いよいよ春がやって来た。
Spring has finally arrived.
いよいよ明日で卒業か...。
Tomorrow is finally our graduation, isn't it…
2More and more
Things get more serious or more obvious, like 「ますます」: 「いよいよ悪化する」 (get worse and worse).
台風が接近するにつれて、いよいよ風が強くなってきた。
As the typhoon came closer, the wind grew stronger and stronger.
彼の話を聞いていると彼がいよいよ怪しくなってきた。
The more I listen to him, the more suspicious he seems.