a short oblique stroke (\): used in some computer operating systems to mark the division between a directory and a subdirectory, as in typing a path. Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
a slash which slopes to the left \

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

1982, new punctuation symbol introduced for computer purposes, from back (adj.) + slash (n.).
Online Etymology Dictionary, © 2010 Douglas Harper
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Computing Dictionary

backslash definition

"\" ASCII code 92. Common names: escape (from C/Unix); reverse slash; slosh; backslant; backwhack. Rare: bash; ITU-T: reverse slant; reversed virgule; INTERCAL: backslat.
Backslash is used to separate components in MS-DOS pathnames, and to introduce special character sequence in C and Unix strings, e.g. "\n" for newline.

The Free On-line Dictionary of Computing, © Denis Howe 2010
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Example sentences
Note that the starting double backslash is required.
To search for a string that contains one of these characters, precede the character with a backslash.
The individual character is preceded by a backslash character rather than enclosing the entire string in double quotes.
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