Definition of lever :
1. A bar, as a capstan bar, applied to a rotatory piece to turn it.
2. A rigid piece which is capable of turning about one point, or axis ( the fulcrum), and in which are two or more other points where forces are applied; -- used for transmitting and modifying force and motion. Specif., a bar of metal, wood, or other rigid substance, used to exert a pressure, or sustain a weight, at one point of its length, by receiving a force or power at a second, and turning at a third on a fixed point called a fulcrum. It is usually named as the first of the six mechanical powers, and is of three kinds, according as either the fulcrum F, the weight W, or the power P, respectively, is situated between the other two, as in the figures.
3. An arm on a rock shaft, to give motion to the shaft or to obtain motion from it.
4. More agreeable; more pleasing.
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- Red grunted, pushed down the lever of the rifle, and began to re- assemble the parts, his friend watching the operation. - "Hopalong Cassidy", Clarence E. Mulford.
- His face grew red, and sweat broke out upon his forehead as if from the physical exertion of trying to put his hand to the lever. - "Human Error", Raymond F. Jones.
- Yet he did not use this powerful lever to further his welfare. - "Promenades of an Impressionist", James Huneker.