/ Dictionary / Index I irrationalize: Meaning and Definition of Find definitions for: ir•ra•tion•al•ize Pronunciation: (i-rash'u-nl-īz"), [key] — -ized, -iz•ing. to make or cause to be irrational. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. irrationality irrational number Related Content Daily Word Quiz: acquiesce Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language