Cantilever (noun)

1. A projecting beam or member supported at only one end, used especially in bridge construction and in the roofs of buildings.
2. A structure or object that projects out from a vertical support, such as a bridge or a balcony.

Origin:

Mid 19th century: from french cantilever, from italian cantileva, from canto "corner, edge" + levare "to raise".

Examples:

1. The bridge was built using cantilever construction.
2. The balcony was a cantilever design that projected out from the building.
3. The cantilever arm held the microscope in place.
4. The cantilever method was used to build the roof of the stadium.
5. The house had a cantilever porch that jutted out over the lake.