noun (n)

• a type of security issued by a corporation (usually together with a bond or preferred stock) that gives the holder the right to purchase a certain amount of common stock at a stated price(noun.possession)

  Synonym:
  stock-purchase warrant, warrant
  

  source: wordnet30
• a written certificate that gives the holder the right to purchase shares of a stock for a specified price within a specified period of time(noun.communication)

  source: wordnet30