/ Dictionary / Index Q qto.: Meaning and Definition of Find definitions for: qto. Pronunciation: [key] quarto. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. qtly. qtr. Related Content Daily Word Quiz: lyceum Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language