Definitions

from The American Heritage® Dictionary of the English Language, 4th Edition

  • transitive v. To refuse to allow: "[The government] disallowed his aging and dying parents any reunion with their only child” ( John Simon).
  • transitive v. To reject as invalid, untrue, or improper.

from Wiktionary, Creative Commons Attribution/Share-Alike License

  • v. To refuse to allow
  • v. To reject as invalid, untrue, or improper

from the GNU version of the Collaborative International Dictionary of English

  • transitive v. To refuse to allow; to deny the force or validity of; to disown and reject.

from The Century Dictionary and Cyclopedia

  • To refuse or withhold permission to or for; refuse to allow, sanction, grant, or authorize; disapprove: as, to disallow items in an account.
  • To decline or refuse to receive; reject; disown.
  • Synonyms To prohibit, forbid, condemn, set aside, repudiate.
  • To refuse allowance or toleration; withhold sanction.

from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.

  • v. command against

Etymologies

Middle English disallowen, from Old French desalouer, to reprimand : des-, dis- + alouer, to approve; see allow.
(American Heritage® Dictionary of the English Language, Fourth Edition)
From Middle English (Wiktionary)

Examples

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