verb (v)

• put in motion or move to act(verb.creation)

  Synonym:
  actuate, set off, spark, spark off, touch off, trigger, trigger off, trip
  

  source: wordnet30
• make active or more active(verb.change)

  Example:
  Activate an old file.
  

  Antonym:
  deactivate, inactivate
  

  source: wordnet30
• make more adsorptive(verb.change)

  Example:
  Activate a metal.
  

  source: wordnet30
• aerate (sewage) so as to favor the growth of organisms that decompose organic matter(verb.change)

  Synonym:
  aerate
  

  source: wordnet30
• make (substances) radioactive(verb.change)

  source: wordnet30
• To make active.(verb)

  source: webster1913