verb (used with object), obliterated, obliterating.
to remove or destroy all traces of; do away with; destroy completely.
to blot out or render undecipherable (writing, marks, etc.); efface.

1590–1600; < Latin oblitterātus (past participle of oblitterāre, efface, cause to be forgotten), equivalent to ob- ob- + litter(a) letter + -ātus -ate1

obliterable [uh-blit-er-uh-buhl] , adjective
obliterator, noun
half-obliterated, adjective
unobliterated, adjective

2. expunge. See cancel.
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Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
obliterate (əˈblɪtəˌreɪt)
(tr) to destroy every trace of; wipe out completely
[C16: from Latin oblitterāre to erase, from ob- out + littera letter]

Collins English Dictionary - Complete & Unabridged 10th Edition
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Word Origin & History

c.1600, from L. obliteratus, pp. of obliterare "cause to disappear, efface," from ob "against" + littera (also litera) "letter, script" (see letter); abstracted from phrase literas scribere "write across letters, strike out letters."
Online Etymology Dictionary, © 2010 Douglas Harper
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American Heritage
Medical Dictionary

obliterate o·blit·er·ate (ə-blĭt'ə-rāt', ō-blĭt'-)
v. o·blit·er·at·ed, o·blit·er·at·ing, o·blit·er·ates

  1. To remove an organ or another body part completely, as by surgery, disease, or radiation.

  2. To blot out, especially through filling of a natural space by fibrosis or inflammation.

o·blit'er·a'tion n.
o·blit'er·a'tive (-ə-rā'tĭv, -ər-ə-tĭv) adj.
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
In some obliterated towns, shops are open and stocked and have electricity.
Conventional schemes would have obliterated the signal with quantum noise
  generated by the measurement itself.
Peaks formed hundreds of millions of years ago are obliterated in months.
We should know who the underdog is and how swiftly that character will get
  obliterated in the absence of a miracle.
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