billion

In 1484, the French mathematician Nicolas Chuquet quietly coined byllion in a manuscript that would not even reach print until 1881. The idea was tidy: attach bi-, “two,” to the -illion family and name the next immense step beyond million. But then arithmetic suffered a linguistic fork in the road. In Britain, a billion traditionally meant a million million—10¹²—while American usage settled on a thousand million, 10⁹, partly under French influence after the Revolutionary War. Britain only began shifting strongly toward the shorter meaning in the mid-20th century, and even tried gillion in 1961 to eliminate the ambiguity. So when someone says “a billion,” the word may still carry two different piles of zeros: nine in most modern English, twelve in the older system.