Dictionary.net

on the affirmative side

on the affirmative side

A Latin preposition signifying for, before, forth.

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

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.

For (in the phrase pro and con, for and against).

Before; fore; forward; for; instead of; as, prolog, pronoun.

A common prefix to words, as in Procatarctic, Prostate, &c.