The Collaborative International Dictionary of English v.0.48:

Comitia \Co*mi"ti*a\, n. pl. [L.] (Rom. Antiq.)
   A public assembly of the Roman people for electing officers
   or passing laws.
   [1913 Webster]

   Note: There were three kinds of comitia: comitia curiata, or
         assembly of the patricians, who voted in curi[ae];
         comitia centuriata, or assembly of the whole Roman
         people, who voted by centuries; and comitia tributa, or
         assembly of the plebeians according to their division
         into tribes.
         [1913 Webster]