self activating

/ˌsɛlf ˈæktɪveɪtɪŋ/
adjective
  1. Starting to work or function on its own, without being turned on by a person.
    • The self-activating sprinkler system turns on when it detects smoke.
    • The software has a self-activating update feature that runs at midnight.
    • A self-activating alarm sounds automatically if the door is opened.
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What does "self activating" mean? | whatsthatwordmean | whatsthatwordmean