Definition of "initiator" in Englisch

noun

1. One who initiates.

2. (chemistry) A substance that initiates a chain reaction or polymerization.

3. (military) A component of a nuclear weapon that produces a burst of neutrons to start the chain reaction.

4. (computing) A task (in a mainframe computer) that initiates multiple jobs.

5. (medicine) A material whose presence in the body eventually leads to cancer.