More precise tagging: the adjective is a past-participle form, not a simple descriptive adjective.
Translations
The activated alarm system alerted the authorities immediately.
Le système d’alarme activé a immédiatement alerté les autorités.
Definitions
Set in motion or made active. The activated alarm system alerted the authorities immediately.
Chemically treated to increase its effectiveness, often used in reference to carbon or charcoal. The activated charcoal was used to purify the water.