pro

Etymology 1

From Late Middle English pro, from Latin prō (“on behalf of”).

noun

1. An advantage of something, especially when contrasted with its disadvantages (cons).
   What are the pros and cons of buying a car?
2. A person who supports a concept or principle.

prep

1. In favor of.
   He is pro exercise but against physical exertion, quite a conundrum.

Etymology 2

Clipping of professional.

noun

1. A professional sportsman.
2. (colloquial) Professional.
   When it comes to DIY, he's a real pro.

adj

1. Professional.
   He landed a pro mentorship gig.

Etymology 3

Clipping of prostitute.

noun

1. (slang) A prostitute.
   1974, "Fynn" (Sydney Hopkins), Mister God, This Is Anna Millie was one of the dozen or so pros who had a house at the top of the street.

Etymology 4

Clipping of proproctor

noun

1. (UK, slang, archaic) A proproctor.

Etymology 5

Clipping of prophylaxis.

noun

1. (slang, historical) A chemical prophylaxis taken after sex to avoid contracting venereal disease.