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Nielsen Ratings, the

 noun
     
Nielsen Ratings, the also the Nielsens [plural] trademark
a system used to show how many people watch a particular US television programme, using information provided by Nielsen Media Research. The Nielsen Ratings are used to decide how much companies will have to pay to advertise their products during a particular programme, and they also help television companies to decide which shows should continue.
Definition from the Longman Dictionary of Contemporary English
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