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Definitions

hallucination

[huh-loo-suh-ney-shuhn] / həˌlu səˈneɪ ʃən /
NOUN
dream, delusion
Synonyms
STRONGEST
illusion phantom
STRONG
aberration apparition fantasy mirage phantasm phantasmagoria trip vision wraith
WEAK
figment of the imagination head trip
Antonyms
STRONGEST
reality
WEAK
experience fact truth

Example Sentences

Examples are provided to illustrate real-world usage of words in context. Any opinions expressed do not reflect the views of Dictionary.com.

"We're in a state of hallucination," says Éva Bognár, a researcher at the Central European University's Democracy Institute.

From BBC • Apr. 4, 2026

Founder Shield incorporates "AI malfunction and hallucination" scenarios specifically into professional services policies covering losses the technology causes clients.

From Barron's • Mar. 15, 2026

These included conditions such as seizures, altered mental status, and hallucination.

From Science Daily • Jan. 5, 2026

This AI hallucination problem remains a significant obstacle to fully autonomous cyberattacks—at least for now.

From The Wall Street Journal • Nov. 23, 2025

I know looking back on it that it was a hallucination.

From "Woodsong" by Gary Paulsen