/ Dictionary / Index M Mach scale: Meaning and Definition of Find definitions for: Mach' scale" Pronunciation: (mak), [key] — Psychol. Psychol. a scale that measures how much deceit and manipulation one will approve or condone in order to achieve some end. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. machree Mach's principle Related Content Daily Word Quiz: feline Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language