Definition of willpower noun from the Oxford Advanced American Dictionary

 

willpower

 noun
noun
NAmE//ˈwɪlˌpaʊər//
 
[uncountable]
 
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the ability to control your thoughts and actions in order to achieve what you want to do He's trying to stay on his diet, but he's got no willpower.
See the Oxford Advanced Learner's Dictionary entry: willpower