• 今晩こんばん — this evening
• 晩ばんご飯はん — dinner
• 毎晩まいばん — every night
• 晩年ばんねん — later years (of life)
• 晩秋ばんしゅう — late autumn
• 晩婚ばんこん — late marriage
• 晩成ばんせい — late blooming/success
• 晩酌ばんしゃく — evening drink

晩 combines 日 (sun) with 免 as a phonetic, pointing to the time when the sun is gone — dusk and nightfall.

By extension, it often carries a nuance of “lateness,” whether time of day (晩ご飯), season (晩秋), or life stage (晩年).

今晩こんばんは 寒さむくなりそうです。
It looks like it will get cold tonight.

晩ばんご飯はんは 何なににしますか？
What shall we have for dinner?