Having a mind willing to listen to opinions that are different from or conflict with your own;
unbiased; unprejudiced.
Unfortunately, it has become a term used by condescending to describe themselves or to mean "you should agree with me."
The irony of term being that modern
psychology disproves that people are incapable of being truly open minded. Therefore, if one was to claim that they are open minded, they must be willing to acknowledge that they are not
open-minded.