This is the 14962nd most frequent Korean word.
반찬이나
"반찬이나" is not a standalone word but a combination of "반찬" (side dishes) and "이나" (or, such as). It refers to "side dishes or something like that."
Here, '반찬이나' follows an enumeration conjunction, implying a choice of side dishes accompanying the main dish.
오늘 저녁으로 고기와 반찬이나 먹을 거예요.
Tonight, we will eat meat and side dishes.
The word '반찬이나' implies either side dishes as an option that one can prepare for the event.
모임에는 반찬이나 음료를 준비해 주시면 좋겠습니다.
For the gathering, it would be nice if you could prepare side dishes or drinks.
In this sentence, '반찬이나' conveys a minor or casual suggestion about preparing some side dishes.