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CPM (Cost Per Mille)

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Definition:

How much it costs an advertiser to show an ad 1,000 times. A $100 CPM means the advertiser paid $100 per every 1,000 times his ad appears on a website. CPM is the most common measurement of online advertising costs. Also known as cost per thousand (Mille is Latin for one thousand).

Its counterpart is RPM (Revenue per Mille).

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