FromLatinarguendō.

arguendo (notcomparable)

1. (law) for the sake ofargument;assuming withoutdeciding; identifying the premises of a hypothetical argument while making it clear that no finding is being made on whether the premises are true.
   • 1978,Matter of Green, 586 F. 2d 1247 - U.S. Court of Appeals, 8th Circuit

     Assumingarguendo that those assertions are factually true, we find respondent's claim to be without legal merit.

   • 1990 February 5, William Safire, “Staying a Superpower”, inThe New York Times‎^[1],→ISSN:

     Grant me,arguendo, that sort of scenario, with the Soviet federation rebuilding and small wars raging here and there, as the world of the millennium.

2. (law)Used to set off the facts presented in an argument on a point of law from facts in dispute in the case.

• Used after the word it modifies, due to the influence of Latin grammar:assuming arguendo not *arguendo assuming.

•  arguendo on Wikipedia.Wikipedia

arguendo

1. gerund ofarguire

• adugnerò,guardone,guarendo

arguendō

1. ablativegerund ofarguō

arguendō

1. dative/ablativemasculine/neutersingular ofarguendus