fal·si·fy

[fawl-suh-fahy] verb, fal·si·fied, fal·si·fy·ing.
verb (used with object)
1.
to make false or incorrect, especially so as to deceive: to falsify income-tax reports.
2.
to alter fraudulently.
3.
to represent falsely: He falsified the history of his family to conceal his humble origins.
4.
to show or prove to be false; disprove: to falsify a theory.
verb (used without object)
5.
to make false statements.
00:10
Falsify is one of our favorite verbs.
So is bowdlerise. Does it mean:
to expurgate (a written work) by removing or modifying passages considered vulgar or objectionable.
to introduce subtleties into or argue subtly about.

Origin:
1400–50; late Middle English falsifien < Middle French falsifier < Late Latin falsificāre. See false, -ify

fal·si·fi·a·ble, adjective
fal·si·fi·a·bil·i·ty, noun
fal·si·fi·ca·tion [fawl-suh-fi-key-shuhn] , noun
fal·si·fi·er, noun
non·fal·si·fi·a·ble, adjective
un·fal·si·fi·a·ble, adjective
un·fal·si·fied, adjective


1, 3. See misrepresent. 4. rebut, discredit, refute, confute, controvert.
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Based on the Random House Dictionary, © Random House, Inc. 2013.
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World English Dictionary
falsify (ˈfɔːlsɪˌfaɪ) [Click for IPA pronunciation guide]
 
vb , -fies, -fying, -fied
1.  to make (a report, evidence, accounts, etc) false or inaccurate by alteration, esp in order to deceive
2.  to prove false; disprove
 
[C15: from Old French falsifier, from Late Latin falsificāre, from Latin falsusfalse + facere to make]
 
'falsifiable
 
adj
 
falsification
 
n
 
'falsifier
 
n

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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Etymonline
Word Origin & History

falsify
mid-15c., "to prove false," from Fr. falsifier, from L.L. falsificare, from L. falsificus "making false," from falsus (see false). Related: Falsified; falsifying. Meaning "to make false" is from c.1500.
Online Etymology Dictionary, © 2010 Douglas Harper
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Example sentences
The nature of science is to debate theories and to test and confirm or falsify
  hypotheses spawned by theories.
She also had a doctor willing to falsify a birth certificate.
More, scientists attempting to falsify is iconic science.
They don't follow the scientific method and they never falsify their patently
  false opinions.
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