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implacable
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impetus

im·pe·tus [ ímpətəss ]


noun 
Definition:
 
1. push: the energy or motivation to accomplish or undertake something

2. physics force: a force that causes the motion of an object to overcome resistance and maintain its velocity

[Mid-17th century. < Latin, "assault, force" < impetere "assail" < petere "seek"]
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