redenomination

Noun

 * 1) The process of redenominating.
 * 2)  The recalibration of the face value of a currency, most frequently by multiplying that value by a power of 10, sometimes followed by the demonetization of any cash issued with the original face value.

Usage notes
In the most technical sense, redenominating always results in a new currency due to the issue of a new code, even though the popular conception might be that only the face value, rather than the currency itself, has changed. However, the term is usually (though not always) used to imply that the new currency was issued for the purpose of recalibration, regardless of whether there is a general perception of a change of currency. For example, the was recalibrated in 1983 and then replaced by the  in 1985, but both instances are frequently referred to as redenomination because they were done for the same reason (to combat hyperinflation).