pro

[change] Noun

(countable) A pro is somebody who is very good at what they do; short for professional.

She's real pro who cares about her job.

When it comes to computers, Jacob's an old pro.
(countable) A pro is somebody who is paid to play sports, sometimes as a teacher; short for professional.

He began his career as a golf pro in Indiana, and later taught golf to Bob Hope.

Pros in the Tour de France often ride custom bicycles that cost over $10,000.

She turned pro in March 2000 at 14, making her the youngest female professional in South Korea.

Pro basketball is one of the country's top sports.
(countable); (plural) The pros and cons of a situation are the positive parts and the negative parts.

What are the pros and cons of going from one method to the other?

Preposition
pro

If you are pro something, you like it, you support it, or you think it's a good idea.

Yet when they got into the war, he was very pro the country winning the war.