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Legal Dictionary
  • A Fortiori Argument
A Fortiori Argument
A fortiori argument means an argument from a strong source. This term is derived from the Latin legal maxim argumentum a fortiori. A fortiori argument is applied by following the logic that a point to be proved is followed from a stronger claim. This principle is applied in situations where: 1. a proposition previously given or proven in the argument contains and implies a variety of "weaker" or less contentful materials ; and 2. a proposition being proven is only one of the propositions contained and implied. There are mainly two types of a fortiori argument. They are: 1. a maiore ad minus, that means from greater to smaller; and 2. a minore ad maius, that means from smaller to greater.