DictionaryhallucinateFalse perception
verb

hallucinate

huh-LOO-sih-nayt/həˈluːsɪneɪt/

To experience an invented perception as though it were real.

The person hallucinates a butterfly and reaches into the empty space.

A fully clothed adult reaches toward a translucent imagined butterfly in an otherwise empty room; faint duplicate inset reveals empty space.
Etymology

Latin alucinari described wandering in the mind or dreaming. The English sense narrows this mental wandering to perceiving something that is not actually present.

In context

Preston Dennett37:39
he was starting to hallucinate he would see boats and it immediately evaporate and he knew death was coming soon
Saved by Aliens! Twelve Benevolent Encounters

More examples

  • During his high fever, he hallucinated insects crawling across the ceiling.
  • Severe sleep deprivation can cause people to hallucinate.
  • The chatbot sometimes hallucinates facts and presents them confidently.

Forms

hallucinate · hallucinates · hallucinated · hallucinating

hallucination noun — A perception of something not actually present.

hallucinatory adjective — Involving or resembling perceptions of nonexistent things.

Similar words

imagine
Can describe deliberate mental pictures without mistaking them for reality.
dream
Usually involves experiences during sleep, not perceptions while awake.