Definitions
American Heritage® Dictionary of the English Language, Fourth Edition
- n. Third-class mail, such as advertisements, mailed indiscriminately in large quantities.
Wiktionary
- n. any mail or letters that are not welcome or solicited and typically sent in bulk; especially mail of a commercial nature such as advertising circulars and form letters
WordNet 3.0
- n. third-class mail consisting of advertising and often addressed to `resident' or `occupant'
Etymologies
- From junk + mail (Wiktionary)
Examples
“According to ForestEthics, more than 100 billion pieces of junk mail are delivered to U.S. households annually—more than eight hundred pieces per household—almost half of which 44 percent is thrown away before being opened.37 This consumes more than 100 million trees, equivalent to clear-cutting the entire Rocky Mountain National Park every four months.38”
“Now they’re upping the ante by campaigning to establish a national Do Not Mail Registry, like the Do Not Call Registry, to stop the incessant flow of junk mail to our homes.”
Lists
These user-created lists contain the word ‘junk mail’.
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Things that Can (and Should) be set O...
The words piano and sister may not appear on this list. It all started on flaming piano.
bottled water, dudley moore, wads of unpaid bills, casu marzu factories, pogroms, frozen pizzas, breakable glass f..., cacophonists, intransigents, belligerent smurfs, police academy re..., unidentified samp... and 103 more...
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Headlines & Newsmakers
frugality, environment, extinction, bible, killer, jazz, cloning, dead, god, moon, global warming, bailout and 340 more...
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Things from my memory
nigger baby, mexican jumping bean, puddle jumper, mood ring, pet rock, cat scratch fever, taxman, hippie, vaseline, argyrol, mercurchrome, methiolade and 655 more...
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Valuseless
Of low worth or little importance.
Unwanted matter by drusky is a nice, related list.trivial, cheap, inutile, ineffectual, dross, floccinaucinihili..., gimcrack, frippery, invalidated, drivel, otiose, tripe and 91 more...
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Apples to Apples: Red Cards
A complete list of the red cards (things) from the popular word game.
bad haircut, carnival workers, grave robbers, Chinatown, a cheap motel, killer whales, UV rays, flat tire, Japan, Michelangelo, Alfred Hitchcock, Cindy Crawford and 734 more...
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Take a Letter, Maria
Types of letters and correspondence
epistle, open letter, letter to the editor, business letter, cover letter, love letter, mash note, valentine, billet-doux, billet, brevet, memo and 25 more...
Tweets
Looking for tweets for junk mail.

treeseed Postal mail used in direct marketing
Spam: electronic junk mail Feb 5, 2008