1. devices that start combustion or ignition in engines, furnaces, or other equipment
2. people or things that cause something to begin or start
Usage: figurative

Examples

• The mechanic replaced the faulty igniters in the gas furnace.
• Modern jet engines use electronic igniters instead of spark plugs.
• The rocket’s igniters fired in sequence to start the main engines.
• She was one of the igniters of the social movement.
• The igniters on the stove weren’t working properly.
• These protesters served as igniters for widespread reform.
• The technician checked all the igniters before starting the system.