n an electric motor for starting an engine
n a contestant in a team sport who is in the game at the beginning
n the official who signals the beginning of a race or competition
n any new participant in some activity
n food or drink to stimulate the appetite (usually served before a meal or as the first course)
n a hand tool consisting of a rotating shaft with parallel handle
n a culture containing yeast or bacteria that is used to start the process of fermentation or souring in making butter or cheese or dough