Webster's English Dictionary

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sabbath

Sab.bath \'sab-*th\ n [ME sabat, fr. OF & OE, fr. L sabbatum, fr. Gk 
   sabbaton, fr.]Heb shabba-th, lit., rest often cap  1a: the seventh day of 
   the week observed from Friday evening to Saturday ev ening as a day of rest 
   and worship by Jews and some Christians 1b: Sunday observed among 
   Christians as a day of rest and worship  2: a time of rest