To convert something into a decimal system or to express something using decimals.
From 'decimal' (adjective, from Latin 'decimus' meaning tenth) plus the verb-forming suffix '-ize'. This became a necessary word in the 18th-19th centuries as nations modernized their measurement systems.
When India decimalized its currency in 1957, they had to educate an entire population about the new system—it was one of the largest educational campaigns in history, teaching hundreds of millions of people a new way to think about money.
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