What is the meaning of activated?

verb

• Put in motion or move to act.
  • usage: "trigger a reaction"; "actuate the circuits"
  • synonyms: trip, actuate, trigger, activate, set off, spark off, spark, trigger off, touch off
• Make active or more active.
  • usage: "activate an old file"
  • synonyms: activate
• Make more adsorptive.
  • usage: "activate a metal"
  • synonyms: activate
• Aerate (sewage) so as to favor the growth of organisms that decompose organic matter.
  • synonyms: activate, aerate
• Make (substances) radioactive.
  • synonyms: activate

adjective

• Of sewage. ( treated with aeration and bacteria to aid decomposition)
• Of e. G. A molecule. ( made reactive or more reactive)
  • synonyms: excited
• Rendered active; e. G. Rendered radioactive or luminescent or photosensitive or conductive.
• Military) set up and placed on active assignment. (
  • usage: "a newly activated unit"