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a support, as of metal or wood, projecting from a wall or the like to hold or bear the weight of a shelf, part of a cornice, etc.
a shelf or shelves so supported.
Also called square bracket. one of two marks [ or ] used in writing or printing to enclose parenthetical matter, interpolations, etc.
brackets, parentheses of various forms indicating that the enclosed quantity is to be treated as a unit.
(loosely) vinculum ( def 2 ).
Informal. an expression or formula between a pair of brackets.
a grouping of people based on the amount of their income: the low-income bracket.
a class; grouping; classification: She travels in a different social bracket.
any horizontally projecting support for an overhanging weight, as a corbel, cantilever, or console.
any of a series of fancifully shaped false consoles beneath an ornamental cornice.
(on a staircase) an ornamental piece filling the angle between a riser and its tread.
a flat plate, usually triangular with a flange on one edge, used to unite and reinforce the junction between two flat members or surfaces meeting at an angle.
any member for reinforcing the angle between two members or surfaces.
a projecting fixture for gas or electricity.
Gunnery. range or elevation producing both shorts and overs on a target.
verb (used with object)
to furnish with or support by a bracket or brackets.
to place within brackets; couple with a brace.
to associate, mention, or class together: Gossip columnists often bracket them together, so a wedding may be imminent.
Gunnery. to place (shots) both beyond and short of a target.
Photography. to take (additional shots) at exposure levels above and below the estimated correct exposure.

1570–80; earlier also brag(g)et (in architecture); of obscure origin

unbracketed, adjective
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
bracket (ˈbrækɪt)
1.  an L-shaped or other support fixed to a wall to hold a shelf, etc
2.  one or more wall shelves carried on brackets
3.  architect corbel ancon See also console a support projecting from the side of a wall or other structure
4.  Also called: square bracket either of a pair of characters, [ ], used to enclose a section of writing or printing to separate it from the main text
5.  parenthesis square bracket a general name for brace
6.  a group or category falling within or between certain defined limits: the lower income bracket
7.  the distance between two preliminary shots of artillery fire in range-finding
8.  a skating figure consisting of two arcs meeting at a point, tracing the shape
vb , -kets, -keting, -keted
9.  to fix or support by means of a bracket or brackets
10.  to put (written or printed matter) in brackets, esp as being irrelevant, spurious, or bearing a separate relationship of some kind to the rest of the text
11.  to couple or join (two lines of text, etc) with a brace
12.  (often foll by with) to group or class together: to bracket Marx with the philosophers
13.  to adjust (artillery fire) until the target is hit
[C16: from Old French braguette codpiece, diminutive of bragues breeches, from Old Provençal braga, from Latin brāca breeches]

bracketing (ˈbrækɪtɪŋ)
1.  a set of brackets
2.  photog a technique in which a series of test pictures are taken at different exposure levels in order to obtain the optimum exposure

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009
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Word Origin & History

1570s, bragget, probably from M.Fr. braguette "codpiece armor" (16c.), from a fancied resemblance of that article to architectural supports (Sp. cognate bragueta meant both "codpiece" and "bracket"), dim. of brague "knee pants," ultimately from Gaulish *braca "pants," itself perhaps from Germanic (cf.
O.E. broc "garment for the legs and trunk;" see breeches). The sense might reflect the "breeches" sense, on the notion of two limbs or of appliances used in pairs. The typographical bracket is first recorded 1750, so called for its resemblance to double supports in carpentry. Senses affected by L. brachium "arm."
Online Etymology Dictionary, © 2010 Douglas Harper
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Example sentences
Auto bracketing makes it easier to take multiple pictures quickly, without a lot of fussing with gear.
The adjustable bracketing system is then attached to the drum and the pneumatic drill is aligned over the bung.
The rule also permits changes to the bracketing of information in the proprietary version within this one-day period.
No significant petroleum contamination was found in the two streams bracketing the site to the north and south.
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