Etymology
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cantilever (n.)

"projecting block or bracket from a building supporting a molding, balcony, etc.," 1660s, probably from cant (n.2) + lever, but earliest form (c. 1610) was cantlapper. First element also might be Spanish can "dog," architect's term for an end of timber jutting out of a wall, on which beams rested. Related: Cantilevered.

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Definitions of cantilever
1
cantilever (v.)
project as a cantilever;
cantilever (v.)
construct with girders and beams such that only one end is fixed;
Frank Lloyd Wright liked to cantilever his buildings
2
cantilever (n.)
projecting horizontal beam fixed at one end only;
From wordnet.princeton.edu