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In the USA, the word exa is to giga as the word quintillion is to what?

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Answer: billion

The base unit metric prefixes for non-fractions are: deka (10), hecto (10**2), kilo (10**3 or thousand), mega (10**6 or million), giga (10**9 or billion), tera (10**12 or trillion), peta (10**15 or quadrillion), and exa (10**18 or quintillion) -- where ** means "to the power of."

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