Cost Per Thousand - CPM

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Dictionary Says

Definition of 'Cost Per Thousand - CPM'

Web sites that sell advertising will guarantee an advertiser a certain number of impressions quoted at X dollars per CPM.
Investopedia Says

Investopedia explains 'Cost Per Thousand - CPM'

For example, a Web site that has a CPM rate of $20 and guarantees advertisers 100,000 impressions, will charge $2,000 ($20 x 100).

Why the M? It's the roman numeral for 1000.

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