The Collaborative International Dictionary of English v.0.48:

Tribunician \Trib`u*ni"cian\, Tribunitial \Trib`u*ni"tial\,
Tribunitian \Trib`u*ni*tian\, a. [L. tribunicius, tribunitius:
   cf. F. tribunitien.]
   Of or pertaining to tribunes; befitting a tribune; as,
   tribunitial power or authority. --Dryden.
   [1913 Webster]

         A kind of tribunician veto, forbidding that which is
         recognized to be wrong.                  --Hare.
   [1913 Webster]