n. (货币)废止通用, (通货)废止使用

[ noun ]
ending something (e.g. gold or silver) as no longer the legal tender of a country
<noun.act>

demonetization \de*mon`e*ti*za"tion\, n.
The act of demonetizing, or the condition of being
demonetized; specificially, the declaration by a government
that something (e.g. gold or silver) is no longer the legal
tender of a country; as, the demonetization of gold.
[1913 Webster + WordNet 1.5]