An alternative or variant spelling of cantilever; a projecting beam or structure supported at only one end.
A variant spelling of 'cantilever,' which comes from probably 'cant' (to tilt or slant) combined with 'lever,' though the etymology is uncertain and may have roots in Italian or Spanish building terms.
Engineers love cantilevers because they create those dramatic overhangs in buildings and bridges without visible support—it looks like magic, but it's actually careful mathematics ensuring the support point carries far more weight than the overhang.
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