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  • to make active or more active as
  • make (as molecules) reactive or more reactive
  • convert (as a provitamin) into a biologically active derivative
  • make (a substance) radioactive
  • treat (as carbon or alumina) so as to improve adsorptive properties
  • set up or formally institute (as a military unit) with the necessary personnel and equipment
  • put (an individual or unit) on active duty
  • become active