Now generally taken as being one thousand millions (i.e. 1 × 109). In Europe it was formerly quantified as one million millions (i.e. 1 × 1012) but this has fallen into...

1,000,000,000 (alternately known as one thousand million and one billion, see below) is the natural number following 999,999,999 and preceding 1,000,000,001. In scientific notation, it is written as 109. In modern ('short scale') English language...