N-VOC （用于称呼非常喜爱的人）最亲爱的 You can call someone dearest when you are very fond of them.

ADJ-SUPERL (用于信函抬头的名字或称谓前)最亲爱的 When you are writing to someone you are very fond of, you can use dearest at the beginning of the letter before the person's name or the word you are using to address them.

ADJ-SUPERL (愿望等）最热切的，最由衷的 Your dearest wishes or hopes are things that you hope very much will happen.