(prō) noun plural pros
1. An argument or vote in favor of something: in the phrase pros and cons.
2. One who votes for or favors a proposal: usually in the plural.
—adverb In behalf of; in favor of; for: to argue pro and con. [<L pro for]

(prō) noun plural pros Colloq.
1. A professional athlete.
2. An expert in any field.

1. Forward; to or toward the front from a position behind; forth: produce, to lead forth; project, to throw forth.
2. Forth from its place; away: profugate, to flee away.
3. To the front of; forward and down: prolapse, to slip forward and down.
4. Forward in time or direction: proceed, to go forward.
5. In front of: prohibit, to hold in front of.
6. In behalf of: prolocutor.
7. In place of; substituted for: procathedral, proconsul.
8. In favor of: pro–Russian. [<L pro- <pro before, forward, for]

1. Prior; occurring earlier in time: prognosis.
2. Situated in front; forward; before: prognathous. [<Gk. pro- <pro before, in front]