noun (n)

• a line of text serving to indicate what the passage below it is about(noun.communication)

  Example:
  The heading seemed to have little to do with the text.
  

  Synonym:
  head, header
  

  source: wordnet30
• the direction or path along which something moves or along which it lies(noun.location)

  Synonym:
  aim, bearing
  

  source: wordnet30
• a horizontal (or nearly horizontal) passageway in a mine(noun.artifact)

  Synonym:
  drift, gallery
  

  source: wordnet30
• The act or state of one who, or that which, heads; formation of a head.(noun)

  source: webster1913