hallucinate
verb
hal·lu·ci·nate
hə-ˈlü-sə-ˌnāt 
hallucinated; hallucinating
1
: to affect with visions or imaginary perceptions
2
: to perceive or experience as a hallucination
: to have hallucinations
Examples of hallucinate in a Sentence
The patient may hallucinate if she has a fever.
Recent Examples on the Web
Without a unified, clean, and accessible data structure, AI outputs quickly become ambiguous, hallucinated, and diluted, deepening the clarity crisis rather than resolving it.
—
Ali Hoss,
Forbes.com,
30 June 2026
Back in season 1, episode 8, Neil Fak (Matty Matheson) hallucinates a conversation with The Bear’s Ballbreaker arcade game character.
—
Kirsten Acuna,
PEOPLE,
26 June 2026
The infamous finale moment saw Meredith Grey (Ellen Pompeo) hallucinate a picturesque beach meeting with Lexie and Mark while fighting for her life against COVID-19.
—
Shania Russell,
Entertainment Weekly,
1 June 2026
To address the former issue, members of the Tarteel team built an MCP server atop ChatGPT and Claude so that those chatbots correctly reference the Quran and Islamic literature and don’t hallucinate verses.
—
Andrew R. Chow,
Time,
26 May 2026
See All Example Sentences for hallucinate
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Ali Hoss,
Forbes.com,
30 June 2026
Back in season 1, episode 8, Neil Fak (Matty Matheson) hallucinates a conversation with The Bear’s Ballbreaker arcade game character.
—
Kirsten Acuna,
PEOPLE,
26 June 2026
The infamous finale moment saw Meredith Grey (Ellen Pompeo) hallucinate a picturesque beach meeting with Lexie and Mark while fighting for her life against COVID-19.
—
Shania Russell,
Entertainment Weekly,
1 June 2026
To address the former issue, members of the Tarteel team built an MCP server atop ChatGPT and Claude so that those chatbots correctly reference the Quran and Islamic literature and don’t hallucinate verses.
—
Andrew R. Chow,
Time,
26 May 2026
See All Example Sentences for hallucinate
Cite this Entry
“Hallucinate.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/hallucinate. Accessed 6 Jul. 2026.
Copy CitationKids Definition
hallucinate
verb
hal·lu·ci·nate
hə-ˈlüs-ə-ˌnāt
hallucinated; hallucinating
: to have hallucinations or experience as a hallucination
Medical Definition
hallucinate
verb
hal·lu·ci·nate
hə-ˈlüs-ᵊn-ˌāt
hallucinated; hallucinating
1
: to affect with visions or imaginary perceptions
the patient is not hallucinated
2
: to perceive or experience as a hallucination
may hallucinate monsters or attackers—M. J. Horowitz
M. J. Horowitz
: to have hallucinations
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