Source : Webster's Revised Unabridged Dictionary (1913)

Judaism \Ju"da*ism\, n. [L. Juda["i]smus: cf. F. juda["i]sme.]
   1. The religious doctrines and rites of the Jews as enjoined
      in the laws of Moses. --J. S. Mill.

   2. Conformity to the Jewish rites and ceremonies.

Source : WordNet®

Judaism
     n 1: Jews collectively who practice a religion based on the Torah
          and the Talmud [syn: {Hebraism}, {Jewish religion}]
     2: the monotheistic religion of the Jews having its spiritual
        and ethical principles embodied chiefly in the Torah and
        in the Talmud