In tYour "mind" means the things which happen inside your head, or inside your brain - your thinking, in other words. We can say, for example, that someone has "a good mind" -that means, they think clearly and logically. Or we can say that someone has a mathematical mind - they are naturally good at maths. Or we can say about someone "she has a mind of her own" - that means, she thinks for herself, she does not just accept what other people say.