noun (n)

• the metal or paper medium of exchange that is presently used(noun.possession)

  source: wordnet30
• general acceptance or use(noun.attribute)

  Example:
  The currency of ideas.
  

  source: wordnet30
• the property of belonging to the present time(noun.attribute)

  Example:
  The currency of a slang term.
  

  Synonym:
  currentness, up-to-dateness
  

  source: wordnet30
• A continued or uninterrupted course or flow like that of a stream; as, the currency of time.(noun)

  source: webster1913