verb (used without object)
to return to a former habit, practice, belief, condition, etc.: They reverted to the ways of their forefathers.
Law. to go back to or return to the former owner or to his or her heirs.
Biology. to return to an earlier or primitive type.
to go back in thought or discussion: He constantly reverted to his childhood.
a person or thing that reverts.
Law. a reversion.

1250–1300; Middle English reverten (< Old French revertir) < Latin revertere to turn back, equivalent to re- re- + vertere to turn; see verse

revertible, adjective
revertibility, noun
revertive, adjective
revertively, adverb
nonrevertible, adjective
nonrevertive, adjective
unreverted, adjective
unrevertible, adjective
unreverting, adjective

1, 3. retrogress. Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
vb (foll by to)
1.  to go back to a former practice, condition, belief, etc: she reverted to her old wicked ways
2.  to take up again or come back to a former topic
3.  biology (of individuals, organs, etc) to return to a more primitive, earlier, or simpler condition or type
4.  (US) to reply to someone: we will revert to you with pricing and other details
5.  property law (of an estate or interest in land) to return to its former owner or his heirs when a grant, esp a grant for the lifetime of the grantee, comes to an end
6.  revert to type to resume characteristics that were thought to have disappeared
7.  a person who, having been converted, has returned to his former beliefs or Church
[C13: from Latin revertere to return, from re- + vertere to turn]
usage  Since back is part of the meaning of revert, one should not say that someone reverts back to a certain type of behaviour

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009
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Word Origin & History

c.1300, "to come to oneself again," from O.Fr. revertir, from V.L. *revertire, variant of L. revertere "turn back," from re- "back" + vertere "to turn" (see versus). Of position or property from 1447; application to customs and ideas is from 1612.
Online Etymology Dictionary, © 2010 Douglas Harper
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American Heritage
Medical Dictionary

revert re·vert (rĭ-vûrt')
v. re·vert·ed, re·vert·ing, re·verts

  1. To return to a former condition, practice, subject, or belief.

  2. To undergo genetic reversion.

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
But when things become psychologically too bewildering or frustrating for him,
  he may revert to spontaneous play.
And it only follows that humanity will revert to a subsistence agrarian society
  within the confines of their own homes.
Genetically engineered organisms can revert to wild type, losing the
  expensively implanted genes.
The primary stream was continuous and the volunteers had to revert back to it
  every time they finished a secondary triplet.
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