Power, might, or force; the strength or effectiveness of something, whether physical force, influence, or impact.
その薬は痛みを和らげる威力がある。
That medicine has the power to relieve pain.
彼の一言は会議の流れを変えるほどの威力を持っていた。
His remark had enough force to change the course of the meeting.
嵐の威力で古い木が倒れた。
An old tree was blown down by the storm's force.