noun (n)

• increase by a factor of two(noun.process)

  Example:
  Doubling with a computer took no time at all.
  

  source: wordnet30
• raising the stakes in a card game by a factor of 2(noun.act)

  Synonym:
  double
  

  source: wordnet30
• The act of one that doubles; a making double; reduplication; also, that which is doubled.(noun)

  source: webster1913