Willpower is the ability to control or restrain yourself. If you bake brownies and can keep yourself from tasting them until after dinner, you can thank your willpower.

A less descriptive — but simpler — way to say willpower is simply will. Whichever word you prefer, you can use it to describe someone's deliberate or purposeful control. In the case of willpower, the person is likely to be resisting a temptation or impulse. It takes willpower not to argue with someone whose opinions make you angry, and willpower to eat just one potato chip.

Definitions of willpower

n the trait of resolutely controlling your own behavior

possession, self-command, self-control, self-possession, self-will, will power
control of your emotions
presence of mind
self-control in a crisis; ability to say or do the right thing in an emergency
Type of:
firmness, firmness of purpose, resoluteness, resolution, resolve
the trait of being resolute

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