noun (n)

• mail sent by a sender at one time(noun.group)

  Example:
  The candidate sent out three large mailings.
  

  source: wordnet30
• the transmission of a letter(noun.act)

  Example:
  The postmark indicates the time of mailing.
  

  Synonym:
  posting
  

  source: wordnet30
• A farm.(noun)

  source: webster1913