What Nielsen ratings measure (8)

I believe the answer is:

audience

(Other definitions for audience that I've seen before include "Assembly gathered to watch, say, a play" , "Auntie doesn't like seeing one shrink?" , "Formal interview with ruler or VIP" , "Formal interview with very important person" , "Assembled spectators or listeners" .)

I've seen this clue in The New York Times.

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