disallowance

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dis·al·low

 (dĭs′ə-lou′)
tr.v. dis·al·lowed, dis·al·low·ing, dis·al·lows
1. To refuse to allow: "[The government] disallowed his aging and dying parents any reunion with their only child" (John Simon).
2. To reject as invalid, untrue, or improper.

[Middle English disallowen, from Old French desalouer, to reprimand : des-, dis- + alouer, to approve; see allow.]

dis′al·low′a·ble adj.
dis′al·low′ance n.
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disallowance

noun
2. A turning down of a request: