1.an electric motor for starting an engine
2.a culture containing yeast or bacteria that is used to start the process of fermentation or souring in making butter or cheese or dough;
to make sourdough you need a starter
3.a contestant who is in the game at the beginning
4.the official who signals the beginning of a race or competition
5.any new participant in some activity
6.food or drink to stimulate the appetite (usually served before a meal or as the first course)
7.a hand tool consisting of a rotating shaft with parallel handle