Definition of "initiator" []

• One who initiates (noun)
• A substance that initiates a chain reaction or polymerization (noun)
• A task (in a mainframe computer) that initiates multiple jobs (noun)
• A material whose presence in the body eventually leads to cancer (noun)

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• "This alteration is often described as the initiator of carcinogenesis."
• "CORRESPONDENT: What the document, Stan, says is that over a four-year period the Iranians have been developing a neutron initiator, which is a component, and essential component for a detonator for a nuclear weapon."
• "Ten years later, Costco merged with The Price Company, known as the initiator of the warehouse club concept."