To begin or commence an action, process, or event. verb
She decided to start a new book this weekend.
The race will start at 10 AM sharp.
To cause something to begin functioning or operating. verb
He pressed the button to start the machine.
Can you start the car for me?
To suddenly move or react with surprise or alarm. verb
She started when she heard a loud noise.
He started at the unexpected touch on his shoulder.
The point in time or space at which something begins. noun
The start of the movie was very exciting.
They were ready at the start of the race.