LATIN DICTIONARYLexicon Latīnum
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“delusion” in Latin

The English word delusion itself goes back to Latin lūdō, through dēlūsiō.

Riddle & Arnold A Copious and Critical English–Latin Lexicon, 1864

delusion
Act of deluding; [Vid: DECEPTION].
Delusive representation; false notion, etc., opinio falsa: error: vana spes (delusive hope): a pleasant delusion, error felicissimus or gratissimus: to be under a happy delusion, errore ielicissimo duci: an optical delusion, mendacium oculorum (a false report made by the sense of sight): ludibrium oculorum (Curt.): superstition, a delusion, by which the human mind is enslaved, mentium humanarum ludibrium superstitio (Liv.): to make anybody believe a delusion, in fraudem aliquem impellere.

Quick answer

What is the Latin word for delusion?
The usual Latin words for “delusion” are errō, grātus. The right choice depends on the sense; see the distinctions below.

Entry from J. E. Riddle & T. K. Arnold, A Copious and Critical English–Latin Lexicon (rev. C. Anthon, New York: Harper, 1864), digitised by Fergus J. P. Walsh, CC BY-SA 4.0; Latin markup adapted by latindictionary.co.