Pro

• POS: Adjective, Noun, Preposition, Adverb

CIDE DICTIONARY

Pro, prep. [L.; akin to prae before, Gr. , and E. for. See For, prep., and cf. Prior, a.].

 A Latin preposition signifying for, before, forth.  [1913 Webster]

Pro confesso [L.] (Law), taken as confessed. The action of a court of equity on that portion of the pleading in a particular case which the pleading on the other side does not deny. -- Pro rata. [L. See Prorate.] In proportion; proportion. -- Pro re nata [L.] (Law), for the existing occasion; as matters are.

Pro, adv. 

 For, on, or in behalf of, the affirmative side; -- in contrast with con.  [1913 Webster]

Pro and con, for and against, on the affirmative and on the negative side; as, they debated the question pro and con; -- formerly used also as a verb. -- Pros and cons, the arguments or reasons on either side.

OXFORD DICTIONARY

Pro, abbr.
1 Public Record Office.
2 public relations officer.

Pro, n. & adj. colloq.
--n. (pl. -os) a professional.
--adj. professional.

Idiom

pro-am involving professionals and amateurs.

Pro, 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.

Idiom

pros and cons reasons or considerations for and against a proposition etc.

Etymology

L, = for, on behalf of

THESAURUS

Pro

Admirable Crichton, adept, advocating, all for, approving, argument, argumentum, artisan, artist, attache, authority, aye, backing, case, con, connaisseur, connoisseur, cons, consideration, consultant, cordon bleu, crack shot, craftsman, dead shot, diplomat, diplomatist, doyen, elder statesman, elenchus, experienced hand, expert, expert consultant, favorable, favoring, for, functional, gownsman, graduate, handy man, ignoratio elenchi, in favor of, industrial, interest, journeyman, marksman, master, nay, no, no slouch, official, old pro, plaidoyer, plea, pleading, politician, professional, professor, proficient, pros, pros and cons, reason, refutation, savant, seasoned professional, shark, sharp, side, special pleading, statesman, supporting, talking point, technical, technical adviser, technician, the affirmative, the negative, vocational, well-disposed, well-inclined, whiz, with