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re-

  1. 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.
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Also red-.

Origin of re-

Middle English < Latin re-, red-
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018

British Dictionary definitions for re-

re-

prefix
  1. indicating return to a previous condition, restoration, withdrawal, etcrebuild; renew; retrace; reunite
  2. indicating repetition of an actionrecopy; remarry
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Word Origin

from Latin

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 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012

Word Origin and History for re-

word-forming element meaning "back to the original place; again, anew, once more," also with a sense of "undoing," c.1200, from Old French and directly from Latin re- "again, back, anew, against," "Latin combining form concievably from Indo-European *wret-, metathetical variant of *wert- "to turn" [Watkins]. Often merely intensive, and in many of the older borrowings from French and Latin the precise sense of re- is lost in secondary senses or weakened beyond recognition. OED writes that it is "impossible to attempt a complete record of all the forms resulting from its use," and adds that "The number of these is practically infinite ...." The Latin prefix became red- before vowels and h-, e.g. redact, redeem, redolent, redundant.

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Online Etymology Dictionary, © 2010 Douglas Harper

re- in Medicine

re-

pref.
  1. Again; anew:rebreathing.
  2. Backward; back:recurvation.
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The American Heritage® Stedman's Medical Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.