Other forms: minds; minded; minding
Your mind is where your thinking happens. If you've made up your mind, you've come to a decision.
Mind can also mean "pay attention to" or "watch." If someone tells you to "mind your manners," they want you to be polite. If you tell them to "mind their own business," maybe they'll leave you alone. When I ask, "Would you mind if I open a window?" I'm asking if this would bother you.