Hallucinate, the root word in "hallucination" comes from Latin hallucinat- ‘gone astray in thought', derived from the Latin verb alucinari, which means "to wander in the mind," "to dream," or "to be deceived". That comes from Greek alussein ‘ be uneasy or distraught’.
The verb "hallucinate" was first recorded in English between 1595 and 1605. The earliest documented use of the verb is from 1604 in the writing of Robert Cawdrey, a Church of England clergyman.
The word "hallucination" itself was introduced into English in 1646 by Sir Thomas Browne, a physician and author. It also derives from the Latin hallūcinātiō, meaning "a wandering of the mind".
Examples of the word hallucinate and hallunination in a sentence:
"He looked up at the ceiling and began to hallucinate."
"Various illnesses can often cause patients to hallucinate," the doctor explained.
"Sleep deprivation really kicked in, and I started to actually hallucinate!"
"People with mental illness might sense themselves going mad and hallucinate about spiders." "
"He has been having hallucinations due to the medication."
"He couldn't tell if what he was seeing was real or it it was a hallucination."