/ Dictionary / Index K Keystone State: Meaning and Definition of Find definitions for: Key'stone State" Pronunciation: [key] Pennsylvania (used as a nickname). Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. Keystoner keystroke Related Content Daily Word Quiz: portent Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language