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Initiator

ɪˈnɪʃieɪtə

Initiator definitions
noun
initiator initiators
  1. a person or thing that initiates someone or something

    "they were the initiators of the movement"

    • a substance which starts a chain reaction

      "the reaction is started by an initiator that bonds to one of the carbon atoms"

    • an explosive or device used to detonate a larger one

      "an initiator causes the bomb to explode"