activation

noun4

1. •
   Making active and effective; bringing into a state of activity.

   • Alarm activations cause the driver to have to stop the train - and in some cases walk back to reset it. The activations caused 1,032 minutes of delays and nine cancellations. — 2021
2. •
   The process of making a radioisotope by bombarding a stable element with neutrons or protons.
3. •
   The process by which molecules are made able to react.
4. •
   The promotion of a brand through an event or campaign.