What is the meaning of the Latin or Greek word re?

Answer 1

As an independent word, re is the ablative singular of the word res, which means "thing, matter, affair" (and many other things besides). It occurs most often in the phrase in re, which means "in the matter [of]".

As a verbal prefix, re- means "back" or "again".

Answer 2

re- is a prefix from Latin

Gives the meaning of repetition or backward motion.

see: re-peat, re-play, re-arrange, re-pel, re-wind, re-ward

Answer 3

Again.