/ Dictionary / Index C concussion: Meaning and Definition of Find definitions for: con•cus•sion Pronunciation: (kun-kush'un), [key] — n. injury to the brain or spinal cord due to jarring from a blow, fall, or the like. shock caused by the impact of a collision, blow, etc. the act of violently shaking or jarring. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. See also: concussion (Thesaurus) concuss concussion grenade Related Content Daily Word Quiz: lyre Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language