Definitions from Wiktionary (initiator)

▸ noun:  One who initiates.
▸ noun:  (chemistry) A substance that initiates a chain reaction or polymerization.
▸ noun:  (military) A component of a nuclear weapon that produces a burst of neutrons to start the chain reaction.
▸ noun:  (computing) A task (in a mainframe computer) that initiates multiple jobs.
▸ noun:  (medicine) A material whose presence in the body eventually leads to cancer.
▸ Also see initiator

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