What does «gana» mean in Spanish?

Craving, desire, appetite.

Examples of use in Spanish: "gana/s de comer".

"gana/s de dormir".
Willingly, gladly.
Reluctantly, reluctantly.
To feel like it, to want to do something.
To have a desire for one, to have animosity towards one.
To be really bad, to be really bad.

♦ Used in: Mexico