Source : Webster's Revised Unabridged Dictionary (1913)

Re- \Re-\ [L. re-, older form (retained before vowels) red-: cf.
   F. re-, r['e]-.]
   A prefix signifying back, against, again, anew; as, recline,
   to lean back; recall, to call back; recede; remove; reclaim,
   to call out against; repugn, to fight against; recognition, a
   knowing again; rejoin, to join again; reiterate, reassure.
   Combinations containing the prefix re- are readily formed,
   and are for the most part of obvious signification.