Source : Webster's Revised Unabridged Dictionary (1913)

Forensic \Fo*ren"sic\, a. [L. forensis, fr. forum a public
   place, market place. See {Forum}.]
   Belonging to courts of judicature or to public discussion and
   debate; used in legal proceedings, or in public discussions;
   argumentative; rhetorical; as, forensic eloquence or
   disputes.

   {Forensic medicine}, medical jurisprudence; medicine in its
      relations to law.

Forensic \Fo*ren"sic\, n. (Amer. Colleges)
   An exercise in debate; a forensic contest; an argumentative
   thesis.

Source : WordNet®

forensic
     adj : used of legal argumentation