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How to say billion and what does billion mean?

billion

noun, adjective

How to pronounce billion?

The word billion sounds like bil-lion
/'bɪljən/

What is the definition of billion?

nounthe number that is represented as a one followed by 9 zeros
nouna very large indefinite number (usually hyperbole)
nounthe 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
adjectivedenoting a quantity consisting of one million million items or units in Great Britain
adjectivedenoting a quantity consisting of one thousand million items or units in the United States