Wordnet 3.0
ADJECTIVE (2)
1. 
 of, relating to, or used in public debate or argument; 
2. 
 used or applied in the investigation and establishment of facts or evidence in a court of law; 
- Example: "forensic photograph"- Example: "forensic ballistics"
The Collaborative International Dictionary of English v.0.48:
Forensic \Fo*ren"sic\, n. (Amer. Colleges)
   An exercise in debate; a forensic contest; an argumentative
   thesis.
   [1913 Webster]
The Collaborative International Dictionary of English v.0.48:
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.
   [1913 Webster]
   Forensic medicine, medical jurisprudence; medicine in its
      relations to law.
      [1913 Webster]
WordNet (r) 3.0 (2006):
forensic
    adj 1: of, relating to, or used in public debate or argument
    2: used or applied in the investigation and establishment of
       facts or evidence in a court of law; "forensic photograph";
       "forensic ballistics"