Etymology
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bloc (n.)
1903, in reference to alliances in Continental politics, from French bloc "group, block," from Old French bloc "piece of wood" (see block (n.1)).
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building (n.)
c. 1300, "a structure;" late 14c., "act or process of constructing;" verbal noun from build (v.). Building-block is 1846 as "one of a set of children's play blocks;" 1849 as "temporary support on which a ship's keel rests while the ship is being constructed;" 1856 as "cinder-block, concrete block, artificial stone block used in building construction." Figurative sense "basic unit from which something is constructed" is by 1955.
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blockage (n.)
"obstruction," 1827, from block (v.1) + -age.
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klutz (n.)
1967, American English, from Yiddish klots "clumsy person, blockhead," literally "block, lump," from Middle High German klotz "lump, ball." Compare German klotz "boor, clod," literally "wooden block" (see clot (n.)).
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en bloc 
French, "in a block" (see bloc).
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clot (n.)

Old English clott "a round mass, lump," from Proto-Germanic *klutto- (source also of Dutch kloot "ball," Danish klods "a block, lump," German Klotz "lump, block"); probably related to or confused with cleat and clod (q.v.). Of blood from 1610s,

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obstructive (adj.)

"having the quality of obstructing, serving or intended to hinder, delay, or annoy," 1610s, from Latin obstruct-, past-participle stem of obstruere "to build up, block, block up, build against, stop, bar, hinder" (see obstruction) + -ive.

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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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blocks (n.)
children's wooden building toys, 1821, from block (n.1).
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blocky (adj.)
1879, "solidly built, stocky," from block (n.1) + -y (2). Related: Blockily; blockiness.
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