noun (n)

• a currency that is not likely to depreciate suddenly in value(noun.possession)

  Example:
  The countries agreed to conduct their bilateral trade in hard currency, replacing previous barter arrangements.
  Germany once had a solid economy, good fiscal and monetary policies, and a hard currency.
  

  source: wordnet30
• money in the form of bills or coins(noun.possession)

  Synonym:
  cash, hard cash
  

  source: wordnet30