A switch or transition from one system, product, or process to another; the time period during which this transition happens.
From 'change' + 'over' (a particle indicating completion or transition). This compound formed naturally in English in the 20th century to describe the many technological transitions industry and society experienced.
The Y2K 'changeover' at the year 2000 cost billions because computers used two-digit years—it's a perfect example of how a tiny technical choice made in the 1960s by programmers trying to save memory created a global problem decades later.
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