Arguendo is a Latin legal term meaning for the sake of argument. "Assuming, arguendo, that ..." and similar phrases are used in courtroom settings and academic legal settings, and occasionally in other domains, to designate provisional and unendorsed assumptions that will be made at the beginning of an argument in order to explore their implications.
A criminal defense attorney may say, "if, arguendo, my client stole the internet data and password, then saving a life would have justified stealing it," thus suggesting that determining the client's guilt or innocence is pointless because they would cause identical legal effects.
Particularly in an appellate court, a judge may ask an attorney what the effects of a different set of assumptions, made arguendo, about the facts governing a situation might be. Asking these questions is especially useful in exploring whether different fact patterns might limit the proper scope of a possible holding in a given case.
For a real example in a civil case, see Tiffany and Company's Reply Brief, Tiffany Inc. v. eBay, Inc., 08-3947-CV (U.S. Court of Appeals for the 2nd Circuit 2008): "In any event, assuming arguendo that requiring eBay to take remedial measures would impair eBay's business, that fact cannot relieve eBay of its legal obligations." p. 23, second paragraph.
- The dictionary definition of Arguendo at Wiktionary
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