noun (n)

• the act of subjecting to experimental test in order to determine how well something works(noun.act)

  Example:
  They agreed to end the testing of atomic weapons.
  

  source: wordnet30
• an examination of the characteristics of something(noun.act)

  Example:
  There are laboratories for commercial testing.
  It involved testing thousands of children for smallpox.
  

  source: wordnet30
• the act of giving students or candidates a test (as by questions) to determine what they know or have learned(noun.act)

  Synonym:
  examination
  

  source: wordnet30
• The act of testing or proving; trial; proof.(noun)

  source: webster1913