A million or one million . Please help me

Please tell me the difference between a million and one million. Many thanks!

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If you want to stress the magnitude of something you say ‘a million’ as in ‘there is a million reasons why you should learn English’ while ‘one million’ is just an exact number.

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Exactly as Torsten says and the same applies to -

a/one hundred, dozen, thousand, trillion.

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And, while writing out the number in words, we invariably say one hundred/thousand/million as the case may be. That merely quantifies it.

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