/ Dictionary / Index K ksi: Meaning and Definition of Find definitions for: ksi Pronunciation: [key] one thousand pounds per square inch. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. K-shell K star Related Content Daily Word Quiz: morose Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language