dis·al·low

[dis-uh-lou]
verb (used with object)
1.
to refuse to allow; reject; veto: to disallow a claim for compensation.
2.
to refuse to admit the truth or validity of: to disallow the veracity of a report.

Origin:
1350–1400; Middle English < Old French desallouer. See dis-1, allow

dis·al·low·a·ble, adjective
dis·al·low·a·ble·ness, noun
dis·al·low·ance, noun
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2013.
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World English Dictionary
disallow (ˌdɪsəˈlaʊ) [Click for IPA pronunciation guide]
 
vb
1.  to reject as untrue or invalid
2.  to cancel
 
disal'lowable
 
adj
 
disal'lowance
 
n

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
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00:10
Disallow is a GRE word you need to know.
So is discountenance. Does it mean:
to embarrass, or abash
causing gloom or dejection
Etymonline
Word Origin & History

disallow
late 14c., "to refuse to praise," from O.Fr. desalouer "to blame" (see dis- + allow); meaning "to reject" is from 1550s.
Online Etymology Dictionary, © 2010 Douglas Harper
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Example sentences
If rule applies, disallow general contractor's general overhead and profit.
But why should you disallow scientists to continue to explain to the public.
System safeguards are in place to disallow improper or unacceptable information.
Create the command allow and/or disallow files, if command access control is
  required.
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