junk mail

noun
unsolicited commercial mail.

Origin:
1950–55

Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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Collins
World English Dictionary
junk mail
 
n
untargeted mail advertising goods or services

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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American Heritage
Idioms & Phrases

junk mail

Third-class mail, such as unsolicited advertisements and flyers, that is sent indiscriminately. For example, While we were on vacation the front hall filled up with junk mail. [c. 1950]

The American Heritage® Dictionary of Idioms by Christine Ammer.
Copyright © 1997. Published by Houghton Mifflin.
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Example sentences
One great thing about not changing your birth name, though, is that you can
  spot junk mail right away.
Recycle your own newspapers, magazine pages, or junk mail as gift wrap.
Security experts say cybercrime and junk mail may increase too.
They will know precisely what kind of advertising, coupons and junk mail to
  bombard users with.
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