Opposite words for limitation:
freedom, latitude.
Usage samples:
  1. Moreover, a pledge without limitation he would never take.
    "The Rise of the Dutch Republic, Volume II.(of III) 1566-74", John Lothrop Motley Last Updated: January 25, 2009.
  2. On the whole, however, it must be said that the limitation of competition in the professional and intellectual occupations is in this country still in its infancy.
    "Monopolies and the People", Charles Whiting Baker.
  3. But the King of Spain is not exclusively in possession of the mines of the precious metals; and if he were, his advantage from their possession, and the power of taxation, would be very much reduced by the limitation of demand and consumption in Europe, in consequence of the universal substitution, in a greater or less degree, of paper money.
    "On The Principles of Political Economy, and Taxation", David Ricardo.
  4. And the exact form would be a limitation.
    "Pierre and Luce", Romain Rolland.