1. n. & adj. colloq.
--n. (pl. -os) a professional.
--adj. professional.
Phrases and idioms:
pro-am involving professionals and amateurs.
Etymology: abbr. 2. adj., n., & prep.
--adj. (of an argument or reason) for; in favour.
--n. (pl. -os) a reason or argument for or in favour.
--prep. in favour of.
Phrases and idioms:
pros and cons reasons or considerations for and against a proposition etc.
Etymology: L, for, on behalf of