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square bracket

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noun
  1. bracket(def 3).
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Origin of square bracket

First recorded in 1885–90
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018

British Dictionary definitions for square bracket

square bracket

noun
  1. either of a pair of characters [ ], used to enclose a section of writing or printing to separate it from the main text
  2. Also called: bracket either of these characters used as a sign of aggregation in mathematical or logical expressions indicating that the expression contained in the brackets is to be evaluated first and treated as a unit in the evaluation of the whole
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Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012