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bracket (n.)

1570s, bragget, "architectural support, supporting piece projecting from a vertical surface," probably from French braguette, originally "codpiece armor" (16c.), from a fancied resemblance of architectural supports to that article of attire (Spanish cognate bragueta meant both "codpiece" and "projecting moulding in architecture"), diminutive of brague "knee pants," ultimately from Gaulish *braca "pants," itself perhaps from Germanic (compare Old English broc "garment for the legs and trunk;" see breeches).

The architectural meaning also might be directly from the "breeches" sense, on the notion of two limbs or of appliances used in pairs. The senses have been affected by Latin brachium "arm." The typographical bracket ("marks used to enclose a note, reference, explanation, etc.;" each was formerly a crotchet) is first recorded 1750, so called for its resemblance to double supports in carpentry (a sense attested from 1610s). Meaning "position of being enclosed or bracketed with others" as of equal standing is from 1880.

bracket (v.)

1797, of printed matter, "to enclose in brackets," from bracket (n.). Also, "to couple or connect with a brace" (1827), also figurative, "to couple one thing with another" in writing (1807). Artillery rangefinding sense is from 1903, from the noun (1891) in the specialized sense "distance between the ranges of two shells, one under and one over the object." Related: Bracketed; bracketing. In home-building and joinery, bracketed is attested by 1801.

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Definitions of bracket from WordNet
1
bracket (n.)
a category falling within certain defined limits;
bracket (n.)
either of two punctuation marks (`<' or `>') used in computer programming and sometimes used to enclose textual material;
Synonyms: angle bracket
bracket (n.)
either of two punctuation marks ([ or ]) used to enclose textual material;
Synonyms: square bracket
bracket (n.)
a support projecting from a wall (as to hold a shelf);
Synonyms: wall bracket
2
bracket (v.)
support with brackets;
bracket bookshelves
bracket (v.)
place into brackets;
Please bracket this remark
Synonyms: bracket out
bracket (v.)
classify or group;
From wordnet.princeton.edu