billion

♦♦♦ bil|lion /b'ɪljən/ (billions)
The plural form is billion after a number, or after a word or expression referring to a number, such as `several' or `a few'.
1 [NUM]
A billion is a thousand million.
...3 billion dollars...
This year, almost a billion birds will be processed in the region.
2 [QUANT-PLURAL] QUANT of pl-n
If you talk about billions of people or things, you mean that there is a very large number of them but you do not know or do not want to say exactly how many.
Biological systems have been doing this for billions of years...
He urged US executives to invest billions of dollars in his country.
[PRON]
You can also use billions as a pronoun.
He thought that it must be worth billions.

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