Concussion: An injury to a soft structure, especially the brain, produced by a violent blow or impact and followed by a temporary, sometimes prolonged, loss of function. A concussion of the brain results in transient loss of consciousness or memory.
© 2011.The American Heritage® Science Dictionary
Definition of traumatic brain injury (TBI) : an acquired brain injury caused by external force (such as a blow to the head sustained in a motor vehicle accident or fall or shrapnel or a bullet entering through the skull), Traumatic brain injury occurs when the shock from an explosion damages neurological fibers.
© 2019 Merriam-Webster, Incorporated
Definition of Chronic Traumatic Encephalopathy (CTE) is a progressive degenerative disease of the brain found in people with a history of repetitive brain trauma (often athletes), including symptomatic concussions as well as asymptomatic subconcussive hits to the head that do not cause symptoms. CTE has been known to affect boxers since the 1920’s (when it was initially termed punch drunk syndrome or dementia pugilistica). In recent years, reports have been published of neuropathologically confirmed CTE found in other athletes, including football and hockey players (playing and retired), as well as in military veterans who have a history of repetitive brain trauma. CTE is not limited to current professional athletes; it has also been found in athletes who did not play sports after high school or college.
© 2019 Boston University Research: CTE Center