an electric motor for starting an engine
"The mechanic replaced the faulty starter to get the car's engine running again."
a contestant in a team sport who is in the game at the beginning
"The veteran striker was named as the starter for tonight's match."
the official who signals the beginning of a race or competition
"The starter blew the whistle to begin the marathon."
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"
Someone who starts something.
"The new manager was hired as a starter to launch several innovative projects within the first month."
The person who starts a race by firing a gun or waving a flag
"The track official acted as the starter, blowing his whistle to begin the sprint."
In plain English: A starter is something used to begin an activity, process, or meal.
"The starter was served before the main course."
Usage: Use "starter" to refer specifically to the official responsible for beginning a race, such as in track and field events. Do not use this term generally for anyone initiating an activity unless they are acting in that specific officiating capacity.
Starter is a straightforward compound word formed by adding the suffix "-er" to "start." It originally meant someone or something that initiates an action and has retained this meaning ever since entering English.