Longman Dictionary of Contemporary English
The Collaborative International Dictionary
Self-starter \Self`-start"er\, n. A mechanism (usually one operated by electricity, compressed air, a spring, or an explosive gas), attached to an internal-combustion engine, as on an automobile, and used as a means of starting the engine without cranking it by hand; -- called also a starter.
Douglas Harper's Etymology Dictionary
Wiktionary
n. A person who shows initiative and resourcefulness.
WordNet
n. an energetic person with unusual initiative
an electric starting motor that automatically starts an internal-combustion engine
Usage examples of "self-starter".
The fighter ground crews hit the built-in self-starters, turning the jet engines even as the pilots climbed into the cockpits.
They are forming a very small, very elite group of self-starters like yourself--- mavericks who have strong ethics but few encumbrances in the world.
DeVonne had been a self-starter who made a fortune in soft ice cream in New England, and he didn't understand why an only daughter who had everything would want to take her B.