/ Dictionary / Index N Nielsen: Meaning and Definition of Find definitions for: Niel•sen Pronunciation: (nēl'sun), [key] — n. 1865–1931, Danish composer. See Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. See also: nielsen (Thesaurus) niello Nielsen rating Related Content Daily Word Quiz: rustic Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language