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
So what if the compass hallucinates half the time?
—
Caroline Rose Giuliani, New Yorker, 19 May 2026
Importantly, users should be informed that these models can hallucinate.
—Mohamed Suliman, Boston Herald, 15 May 2026
All 20 of those vendors showed some issue with accuracy or completeness in at least one of these simple tests, including nine that hallucinated patient information, 12 that recorded information incorrectly, and 17 that missed key details about discussed mental health issues.
—ArsTechnica, 14 May 2026
Most notably, the line is crossed when AI hallucinates facts or strips away human voice.
—Rolling Stone Culture Council, Rolling Stone, 11 May 2026
See All Example Sentences for hallucinate
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Caroline Rose Giuliani, New Yorker, 19 May 2026
Importantly, users should be informed that these models can hallucinate.
—Mohamed Suliman, Boston Herald, 15 May 2026
All 20 of those vendors showed some issue with accuracy or completeness in at least one of these simple tests, including nine that hallucinated patient information, 12 that recorded information incorrectly, and 17 that missed key details about discussed mental health issues.
—ArsTechnica, 14 May 2026
Most notably, the line is crossed when AI hallucinates facts or strips away human voice.
—Rolling Stone Culture Council, Rolling Stone, 11 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 21 May. 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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