/ Dictionary / Index T thunderation: Meaning and Definition of Find definitions for: thun•der•a•tion Pronunciation: (thun"du-rā'shun), [key] — interj. an exclamation of surprise or petulance. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. thunder Thunder Bay Related Content Daily Word Quiz: panacea Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language