A dicto simpliciter (Latin: "from a maxim without qualification" -- meaning 'from a universal rule') or ad Dictum simpliciter (Latin: "to a maxim without qualification" -- meaning 'to a universal rule') are Latin phrases for a type of logical fallacy. The a (meaning "from") is often omitted when this phrase is used in English, being mistaken for an indefinite article.
"Dicto simpliciter" fallacies are deductive logical fallacies that occur in statistical syllogisms. A dicto simpliciter occurs when an acceptable exception is ignored or eliminated. For instance, the appropriateness of using opiates is dependent on the presence of extreme pain. To justify the recreational use of opiates by referring to a cancer patient or to justify arresting said cancer patient by comparing him to the recreational user would be a dicto simpliciter.
There are exactly two kinds of a dicto simpliciter: