junk mail

Junk mail is defined as unwanted catalogs, advertisements, coupons and other offerings that are delivered to you via postal mail or email.

(noun)

An email encouraging you to enter a sweepstakes is an example of junk mail.

See junk mail in Webster's New World College Dictionary

☆

advertisements, solicitations, etc. mailed in large quantities, usually by third-class mail

See junk mail in American Heritage Dictionary 4

noun

Third-class mail, such as advertisements, mailed indiscriminately in large quantities.

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