say it: di-LOO-zhuhn
delusion is a noun meaning "(psychology) an erroneous belief that is held in the face of evidence to the contrary". It carries 3 recorded senses.
(psychology) an erroneous belief that is held in the face of evidence to the contrary
psychology
a mistaken or unfounded opinion or idea
“he has delusions of competence”
“his dreams of vast wealth are a hallucination”
Forms marked · are formed by the regular rule rather than recorded in the source data. English keeps a few hundred irregulars and the rest follow the pattern, so the rule is right far more often than not — but it is a rule, and the mark says so.
Definitions, synonyms and semantic relations for delusion come from Princeton University’s WordNet. The pronunciation comes from the CMU Pronouncing Dictionary. Commonness is measured against a corpus of everyday English. Full sources and licences.