1.
hallucination
A sensory perception that appears real but is created by the mind, occurring without any actual external stimulus. Can be visual, auditory, or involve other senses.
Related Words
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幻聴 (auditory hallucination)
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幻想 (fantasy, illusion)
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錯覚 (optical illusion, misperception)
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妄想する (to fantasize)
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幻影 (phantom)