billions

'billions'

[billion.n.01] as in: the number that is represented as a one followed by 12 zeros; in the United Kingdom the usage followed in the United States is frequently seen

'billions'

[million.n.02] as in: a very large indefinite number (usually hyperbole)

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Examples:
there were millions of flies

'billions'

[billion.n.03] as in: the number that is represented as a one followed by 9 zeros