noun (n)

• charge against a citizen's person or property or activity for the support of government(noun.possession)

  Synonym:
  revenue enhancement, tax
  

  source: wordnet30
• government income due to taxation(noun.possession)

  Synonym:
  revenue, tax income, tax revenue
  

  source: wordnet30
• the imposition of taxes; the practice of the government in levying taxes on the subjects of a state(noun.act)

  source: wordnet30
• The act of laying a tax, or of imposing taxes, as on the subjects of a state, by government, or on the members of a corporation or company, by the proper authority; the raising of revenue; also, a system of raising revenue.(noun)

  source: webster1913