Definition of willpower noun from the Oxford Advanced Learner's Dictionary

 

willpower

 noun
noun
BrE BrE//ˈwɪlpaʊə(r)//
 
; NAmE NAmE//ˈwɪlpaʊər//
 
[uncountable]
 
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the ability to control your thoughts and actions in order to achieve what you want to do He’s intelligent but he’s got no willpower.Extra examples I’m no good at losing weight. The trouble is, I’ve no willpower. It took all his willpower to stay in and study. She managed to finish the race by sheer willpower.
See the Oxford Advanced American Dictionary entry: willpower