/ Dictionary / Index K Keystoner: Meaning and Definition of Find definitions for: Key•ston•er Pronunciation: (kē'stō"nur), [key] — n. Informal. a native or inhabitant of Pennsylvania (used as a nickname). Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. Keystone Kop Keystone State 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