1Evening or night — the time from dusk to night; can be used adverbially (e.g., 'in the evening').
晩になると窓の外が急に冷たく感じた。
As evening came, it suddenly felt cold outside the window.
明日の晩、映画を見に行かない？
Would you like to go see a movie tomorrow evening?
晩のニュースを見てから寝る。
I watch the evening news before sleeping.
2An abbreviation for 'dinner' (晩ご飯) — refers to the evening meal (colloquial).
今日の晩はカレーにしようと思う。
I think I'll have curry for dinner tonight.
晩を抜くのは体に良くないよ。
Skipping dinner isn't good for your health.
3A counter for nights (e.g., for counting how many nights something lasts).
三晩寝られなくて疲れた。
I couldn't sleep for three nights and got tired.
何晩か泊まる予定です。
I plan to stay for several nights.