/ Dictionary / Index E earthshaking: Meaning and Definition of Find definitions for: earth•shak•ing Pronunciation: (rth'sh?"king), [key] ? adj. imperiling, challenging, or affecting basic beliefs, attitudes, relationships, etc. Random House Unabridged Dictionary, Copyright 1997, by Random House, Inc., on Infoplease. See also: earthshaking (Thesaurus) earth science earth-shattering Related Content Daily Word Quiz: diurnal Analogy of the Day: Today?s Analogy Spelling Bee: Today?s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language