MENTAL POWER [C, U] › the mental power to control your thoughts and actions or to succeed in doing something difficult: She has a very strong will. [+ to do sth] He lacks the will to win. WANT [no plural] › what someone wants: She was forced to marry him against her will. DOCUMENT [C] › a legal document that gives instructions about what should happen to your money and possessions after you die: She left me some money in her will. → See also free will → See also ill will