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Cantilever is a structural element that projects horizontally from a vertical support and is supported only at one end. The term originates from the Latin word "cantilever," which means "to project or overhang." Cantilevers are commonly used in various engineering and architectural applications due to their ability to distribute loads efficiently and create open spaces.

In structural engineering, cantilevers are often employed in bridges, buildings, and other structures to provide support without the need for additional columns or supports. They can be found in various forms, including overhanging balconies, cantilevered roofs, and bridge decks that extend beyond their supporting columns. The design of cantilevers must carefully consider factors such as material strength, load distribution, and structural stability to ensure safety and longevity.

Cantilevers can also be seen in everyday objects, such as the arms of a chair or the handle of a tool. These elements rely on the principle of cantilever action to provide stability and functionality. The design and analysis of cantilevers involve principles of statics and mechanics, including the calculation of bending moments, shear forces, and deflection.

In summary, a cantilever is a structural element that projects horizontally from a vertical support and is supported only at one end. Its applications range from engineering and architecture to everyday objects, and its design requires careful consideration of structural principles to ensure safety and functionality.