Definition of mail noun from the Oxford Advanced American Dictionary

      

    mail

     noun
    noun
    NAmE//meɪl//
     
    [uncountable]
     
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  1. 1 the official system used for sending and delivering letters, packages, etc. a mail service/train/truck Your check is in the mail. We do our business by mail. see also airmail, snail mail, voice mail
  2. 2 letters, packages, etc. that are sent and delivered There isn't much mail today. I sat down to open the mail. Is there a letter from them in the mail? hate mail (= letters containing insults and threats) see also junk mail, return mail, surface mail
  3. 3messages that are sent or received on a computer Check regularly for new mail. see also electronic mail, e-mail
  4. 4= chain mail a coat of mail
See the Oxford Advanced Learner's Dictionary entry: mail