Passage: A delusion is a firm and fixed belief based on inadequate grounds not amenable to rational argument or evidence to contrary, not in sync with regional, cultural and educational background. As a pathology, it is distinct from a belief based on false or incomplete information, confabulation, dogma, illusion, or some other misleading effects of perception.

Question: What is the word delusion mean when referring to pathology?
distinct from a belief based on false or incomplete information