noun (n)

• backflow of blood through a defective heart valve(noun.event)

  source: wordnet30
• recall after rote memorization(noun.cognition)

  Example:
  He complained that school was just memorization and regurgitation.
  

  source: wordnet30
• the reflex act of ejecting the contents of the stomach through the mouth(noun.act)

  Synonym:
  disgorgement, emesis, puking, vomit, vomiting
  

  source: wordnet30
• The act of flowing or pouring back by the orifice of entrance(noun)

  source: webster1913