What's "define" mean here? It's not like definition of a word.
Native speaker’s answer
Rebecca
You're right! It is different from a "definition of a word." Here, "define" means to draw attention to or to make distinct with a clear outline. Ex: I'll define the type by going around it with a permanent marker. Ex: You can define the eyeshadow by adding a few details with the liquid eyeliner. Ex: The sign isn't very defined.