decimalisation

noun

1. (uncountable, usually)Conversion to a decimal system.

   “In these days of decimalization and metrication it is a pity that SI units were not used as this will date a very useful little book prematurely.”

2. (uncountable, usually)Specifically, conversion of the currencies of the United Kingdom and Ireland in 1971 from pounds, shillings and pence to a decimal system in which one pound was worth 100 new pence (later renamed simply pence).