/ Dictionary / Index D differentiator: Meaning and Definition of Find definitions for: dif•fer•en•ti•a•tor Pronunciation: (dif"u-ren'shē-ā"tur), [key] — n. a person or thing that differentiates. an electronic device whose output signal is proportional to the derivative of its input signal. a transducer or circuitwhose output is proportional to the rate of change of the input signal. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. See also: differentiator (Thesaurus) differentiate difficile Related Content Daily Word Quiz: perspicacious Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language