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activation

/ˌæktəˈveɪʃən/ noun C1
  1. Making active and effective; bringing into a state of activity. (countable, uncountable)
  2. The process of making a radioisotope by bombarding a stable element with neutrons or protons. (countable, uncountable)
  3. The process by which molecules are made able to react. (countable, uncountable)
  4. The promotion of a brand through an event or campaign. (countable, uncountable) · using shopper activation to convert shoppers into buyers

Plural activations

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From the library

Following this, your brain must undergo rule activation, turning off the cognitive rules for the previous task and activating the rules for the new one.
The Myth of Multitasking, p. 1 · C1

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Words, meanings, pronunciations and translations from Wiktionary (CC BY-SA 4.0); how common each word is from wordfreq. Made into this dictionary by FluentPlex.