pro1 plural pros [countable]
someone who is paid to do something, especially play a sport, that other people do for pleasure [= professional; ≠ amateur]:
a tennis pro
the small gap between top amateurs and pros in golf
2 informal also old pro
someone who has had a lot of experience with a particular type of situation:
Cathy's an old pro at organizing raffles.
the advantages and disadvantages of something
the pros and cons of (doing) something
We discussed the pros and cons of going to university.
4 British English old-fashioned informalBO