Definition of media mail in English:

media mail

noun

  • A class of mail for sending books, recordings, and computer media. It is cheaper and usually slower than first-class mail.

    • ‘The actual USPS charge (media mail) is $1.42, leaving 58 cents to cover the rest of their costs.’
    • ‘I know which boxes were shipped media mail, which were insured, which have not yet arrived.’