/ Dictionary / Index D diagonalize: Meaning and Definition of Find definitions for: di•ag•o•nal•ize Pronunciation: (dī-ag'u-nl-īz", -ag'nl-), [key] — -ized, -iz•ing. to transform (a matrix) to a diagonal matrix. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. See also: diagonalize (Thesaurus) diagonal cloth diagonal matrix Related Content Daily Word Quiz: frugal Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language