/ Dictionary / Index N Newtonian: Meaning and Definition of Find definitions for: New•to•ni•an Pronunciation: (n-tō'nē-un, ny-), [key] — adj. of or pertaining to Sir Isaac Newton or to his theories or discoveries: Newtonian physics. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. See also: newtonian (Thesaurus) newton Newtonian fluid Related Content Daily Word Quiz: agitated Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language