The act of refusing to allow something or the state of not being permitted; an official rejection.
From disallow + -ance (a suffix forming nouns from verbs). Disallow combines dis- (reversal) + allow (to permit).
You'll see this word constantly in tax audits and legal disputes—when the IRS issues a 'disallowance,' it means they're rejecting your deduction, and that has real financial consequences!
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