activation
n. C / Un. the act of making something start working or making it active. You use this when you turn on a system, a process, or a chemical reaction.
n. the action of making a person, process, or mechanism active or operative. Often refers to the initiation of a specific biological or chemical function.
The activation of the alarm system happens automatically at night.
The technician confirmed that the activation of the new software would take approximately ten minutes to complete.
In molecular biology, the activation of specific genes is often triggered by environmental stressors, leading to a cascade of cellular responses designed to protect the organism.
Uncountable when referring to the general process; countable when referring to a specific instance or event. Often paired with 'of' followed by the system or process being started.