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An a fortiori argument /ËˆÉ‘Ë fÉ”ËrtÉªËˆoÊŠriË/ is an "argument from a yet stronger reason." For example, if it has been established that a person is deceased , then one can with equal or greater certainty argue that the person is not breathing. "Being dead" trumps other arguments that might be made to show that the person is not breathing, such as for instance, not seeing any sign of breathing.
Wikipedia contributors, "A fortiori," Wikipedia, The Free Encyclopedia, http://en.wikipedia.org/wiki/A_fortioriABOUT THE LATIN LANGUAGE