noun Download 🔗Share A temporary mental state with a sudden onset, usually reversible, including symptoms of confusion, inability to concentrate, disorientation, anxiety, and sometimes hallucinations. Causes can include dehydration, drug intoxication, and severe infection. Examples : "The student's sudden delirium after a long illness made it hard for her to focus in class. " medicine mind disease sensation body condition Chat with AIVocabulary GamePractice Reading