Webster's English Dictionary

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judaism

Ju.da.ism \'ju:d-*-.iz-*m, 'ju:d-e--\ n 1: a religion developed among the 
   ancient Hebrews and marked by belief in o ne God who is creator, ruler, and 
   redeemer of the universe and by the moral and ceremonial laws of the Old 
   Testament and the rabbinic tradition 2: conformity to Jewish rites, 
   ceremonies, and practices  3: the cultural, social, and religious beliefs 
   and practices of the Jews  4: the whole body of Jews