Etymology
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Nielsen

in reference to popularity ratings of TV and radio programs, 1951, named for U.S. market researcher Arthur Clarke Nielsen (1897-1980), founder of A.C. Nielsen Co., which evaluates viewership based on samplings of receiving sets.

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Definitions of Nielsen

Nielsen (n.)
Danish composer (1865-1931);
Synonyms: Carl Nielsen / Carl August Nielsen
From wordnet.princeton.edu