1. A sensory experience of something that does not actually exist, caused by illness, drugs, or extreme stress.
Usage: Usually plural or used in singular form as a count noun.; Common in medical and psychological contexts.

Examples

• The patient reported having hallucinations after taking the medication.
• High fever can sometimes cause hallucinations in children.
• She experienced vivid hallucinations during her illness.
• The doctor asked if he had seen or heard any hallucinations.
• Sleep deprivation may lead to hallucinations and confusion.
• His hallucinations made it difficult to distinguish between what was real and what was not.