- an advantage of something, especially when contrasted with its disadvantages (cons).
- What are the pros and cons of buying a car?
Noun (etymology 2)
- a professional sportsman
- professional someone who is very good at something
- When it comes to DIY, he's a real pro.
Noun (etymology 3)
- A prostitute.
The above text is a snippet from Wiktionary: pro
and as such is available under the Creative Commons Attribution/Share-Alike License.