Webster's Revised Unabridged Dictionary · 1913

Pro-

Pro-

[Latin pro, or Greek {not transcribed}. See Pro.]

A prefix signifying before, in front, forth, for, in behalf of, in place of, according to; as, propose, to place before; proceed, to go before or forward; project, to throw forward; prologue, part spoken before (the main piece); propel, prognathous; provide, to look out for; pronoun, a word instead of a noun; proconsul, a person acting in place of a consul; proportion, arrangement according to parts.

Pro , preposition

[Latin; akin to prae before, Greek {not transcribed}, and English for. See For, prep., and compare Prior, a.]

A Latin preposition signifying for, before, forth.
Collocations (3)
Pro confesso (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 , In proportion; proportion.
Pro re nata (Law) , for the existing occasion; as matters are.

Pro , adverb

For, on, or in behalf of, the affirmative side; -- in contrast with con.
Collocations (2)
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.