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disallow

[dis-uh-lou]
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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 of disallow

First recorded in 1350–1400; Middle English word from Old French word desallouer. See dis-1, allow
Related formsdis·al·low·a·ble, adjectivedis·al·low·a·ble·ness, noundis·al·low·ance, noun
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018

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British Dictionary definitions for disallow

disallow

verb (tr)
  1. to reject as untrue or invalid
  2. to cancel
Derived Formsdisallowable, adjectivedisallowance, noun
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 disallow

v.

late 14c., "to refuse to praise," from Old French desalouer "to blame," from des- (see dis-) + alouer (see allow); meaning "to reject" is from 1550s. Related: Disallowed; disallowing; disallowance.

Online Etymology Dictionary, © 2010 Douglas Harper