de·val·ue 
(dē-văly) also de·val·u·ate (-văly-āt′)
(dē-văly) also de·val·u·ate (-văly-āt′)v. de·val·ued, de·val·u·ing, de·val·ues also de·valu·at·ed or de·val·u·at·ing or de·val·u·ates
v.tr.
1. To lessen or cancel the value of.
2. To lower the exchange value of (a currency) by lowering its gold equivalency.
v.intr.
To lower the exchange value of a currency by lowering its gold equivalency.
de·val′u·ation n.