pro

forward; before; in favor of

Spelled pro · pro 'forward, before, on behalf of'

Latin pro points forward: propel drives forward, protrude thrusts forward, and procrastinate pushes a task toward tomorrow.

Words built from it

proclivity — A natural tendency toward a behavior.
pro- (forward) + cliv (slope) + -ity (state or quality)
profligate — Recklessly wasteful or immoral.
pro- (forward) + flig (strike) + -ate (having been)
propel — Push or drive forward.
pro- (forward) + pel (drive)
protrude — Stick out beyond a surface.
pro- (forward) + trude (thrust)
procrastinate — Keep putting off something that needs doing.
pro- (forward) + crastin (of tomorrow) + -ate (verb ending)
prolong — Make something last longer.
pro- (forward) + long (long)
proponent — Someone who supports an idea or proposal.
pro- (forward) + pon (put) + -ent (one who)
provide — Supply something needed.
pro- (before) + vide (see)

probity — From Latin probitas, meaning uprightness, based on probus, meaning good or honest. Its pro is not this prefix.