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Longman Dictionary of Contemporary English
self-starter
noun
EXAMPLES FROM OTHER ENTRIES
▪ We're looking for creative self-starters with at least three years' experience.
EXAMPLES FROM CORPUS
▪ Employees need to be self-starters with higher than normal creativity and problem solving skills because a supervisor is not nearby.
▪ In the absence of significant parties, nominations could be won by charismatic self-starters who could project an acceptable image.
▪ They are self-starters and want to own their territory and to walk on their own two feet.
The Collaborative International Dictionary
Self-starter

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
self-starter

1894, of engines, 1960, of persons (especially workers), from self- + starter. Self-starting (adj.), of motors, is attested from 1866.

Wiktionary
self-starter

n. A person who shows initiative and resourcefulness.

WordNet
self-starter
  1. n. an energetic person with unusual initiative

  2. 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.