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1 definition found
 for header
From The Free On-line Dictionary of Computing (30 December 2018) :

  header
  
     1. The portion of a packet, preceding the actual data,
     containing source and destination addresses, error checking
     and other fields.
  
     2. The part of an electronic mail message or news article
     that precedes the body of a message and contains, among other
     things, the sender's name and e-mail address and the date and
     time the message was sent.
  

Contact=webmaster@dict.org Specification=RFC 2229