Definition of Sabbath

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Sab·bath    (sbth) KEY 

NOUN:

1. The seventh day of the week, Saturday, observed as the day of rest and worship by the Jews and some Christian sects.
2. The first day of the week, Sunday, observed as the day of rest and worship by most Christians.

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ETYMOLOGY:
Middle English sabat, from Old French sabbat, and Old English sabat both from Latin sabbatum, from Greek sabbaton, from Hebrew abbt, from bat, to cease, rest; see bt in Semitic roots