Usage Note
Activación is the process noun from activar; it drops its accent mark in the plural (activaciones), which is a common pattern for Spanish nouns ending in -ción. It appears in technical contexts (activation of a device, a gene, an account) as well as in neuroscience (activación cerebral) and marketing (activación de marca).
Examples
"La activación del sistema inmune tarda días."
Natural Translation
Activation of the immune system takes days.

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