A billion is the number 1,000,000,000, which is a thousand million. It is often used to talk about money, population, or very large quantities.
From French “billion,” formed from “bi-” (two) + “-illion” modeled on “million.” Historically, some countries used “billion” to mean a million million, but modern English almost always means a thousand million.
A billion is so large that if you counted one number per second without stopping, it would take over 31 years to reach it. That’s why human intuition is terrible at really understanding billion-level numbers.
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