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