
Billion
Numerical Scale
Understand that 'billion' refers to an extremely large number, used in contexts where scale matters.

The earth has over seven billion people.
Cultural Difference
Know that 'billion' can mean 'trillion' in older UK English. Always use the modern definition unless in a historical context.

He was reading about the British government's budget in the early 20th century being reported in billions (meaning trillions).
Emphasis on Quantity
Use 'billion' to emphasize a vast quantity, often implying the number is almost unimaginable.

There are billions of stars in our galaxy.
Compare with
QuadrillionSeptillionTrillion
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