[1] : The Collaborative International Dictionary of English v.0.48

banc \banc\, bancus \ban"cus\, bank \bank\, n. of. banc, ll.
   bancus. see bank, n.
   a bench; a high seat, or seat of distinction or judgment; a
   tribunal or court.
   1913 webster

   in banc, in banco the ablative of bancus, in bank, in
      full court, or with full judicial authority; as, sittings
      in banc distinguished from sittings at nisi prius.
      1913 webster
see also:
bank in banc in banco in bank nisi prius 

Banc >> B Words
Banc, definition of term: Banc
banc_pag1.html

In Banc >> I Words
In Banc, definition of term: In Banc
in+banc_pag1.html