The word "billion" signifies one thousand million (1,000,000,000). It can be used with preceding numbers or in the phrase "billions of" to denote a vast quantity. The plural form, "billions," is employed for unspecified large amounts.
The word "billion" refers to the number one thousand million (1,000,000,000). It can be used with a number before it or as part of "billions of" to indicate a very large quantity. The plural form "billions" is used when referring to an unspecified large number.
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