/ Dictionary / Index S sq. mi.: Meaning and Definition of Find definitions for: sq. mi. Pronunciation: [key] square mile; square miles. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. sq. m sq. mm Related Content Daily Word Quiz: paradox Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language