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First attested in the 1660s, probably from cant ‎(slope) + lever, but the earliest form (c. 1610) was cantlapper. First element may also be Spanish can ‎(dog), an architect's term for an end of timber jutting out of a wall, on which beams rested.


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cantilever ‎(plural cantilevers)

  1. (architecture) A beam anchored at one end and projecting into space, such as a long bracket projecting from a wall to support a balcony.

Derived terms[edit]



cantilever ‎(third-person singular simple present cantilevers, present participle cantilevering, simple past and past participle cantilevered)

  1. To project (something) in the manner of or by means of a cantilever.
    • 2007 October 28, Nicolai Ouroussoff, “Where Gods Yearn for Long-Lost Treasures”, in New York Times[1]:
      Just above, the museums top floor seems to shift slightly, its corners cantilevering over the edge of the story below as if it is sliding off the top of the building.