re-

a prefix, occurring originally in loanwords from Latin, used with the meaning “again” or “again and again” to indicate repetition, or with the meaning “back” or “backward” to indicate withdrawal or backward motion: regenerate; refurbish; retype; retrace; revert.
Also, red-.


Origin:
Middle English < Latin re-, red-

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Based on the Random House Dictionary, © Random House, Inc. 2013.
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World English Dictionary
re-
 
prefix
1.  indicating return to a previous condition, restoration, withdrawal, etc: rebuild; renew; retrace; reunite
2.  indicating repetition of an action: recopy; remarry
 
usage  Verbs beginning with re- indicate repetition or restoration. It is unnecessary to add an adverb such as back or again: This must not occur again (not recur again); we recounted the votes (not recounted the votes again, which implies that the votes were counted three times, not twice)

Collins English Dictionary - Complete & Unabridged 10th Edition
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00:10
Re- is always a great word to know.
So is lollapalooza. Does it mean:
an extraordinary or unusual thing, person, or event; an exceptional example or instance.
a calculus or concretion found in the stomach or intestines of certain animals, esp. ruminants, formerly reputed to be an effective remedy for poison.
Etymonline
Word Origin & History

re-
prefix meaning "back to the original place, again," also with a sense of "undoing," c.1200, from O.Fr. and directly from L. re- "again, back, against." Often merely intensive.
Online Etymology Dictionary, © 2010 Douglas Harper
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American Heritage
Medical Dictionary

re- pref.

  1. Again; anew: rebreathing.

  2. Backward; back: recurvation.

The American Heritage® Stedman's Medical Dictionary
Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
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Example sentences
With technological advances, the frozen cells might someday be used to
  re-create populations of species that face extinction.
What people need to do is re-train themselves in how they think about food.
There's always the risk that you re-watch it and find yourself doing an
  impersonation.
The craft should have a payload bay that could be opened and re-closed for
  re-entry.
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