em dash

noun Printing.
a dash one em long.
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Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
em dash or em rule
printing a dash (—) one em long
em rule or em rule

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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Example sentences
As shown in the examples above, do not put a space on both sides of an em dash.
Understand the origins of the en dash, how it differs from the em dash, and
  whether it still matters.
Use an em dash-instead of a hyphen-as shown here to set off a particular phrase.
If not possible, use two hyphens to create an em dash.
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