G4521 - σάββατον
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Strong's Concordance

No 4521 Original Word σάββατον
Transliteration sabbaton Phonetic Spelling sab'-bat-on
Definitions
  Of Hebrew origin [H7676]; the Sabbath (that is, Shabbath), or day of weekly repose from secular avocations (also the observance or institution itself); by extension a se'nnight, that is, the interval between two Sabbaths; likewise the plural in all the above applications:sabbath (day), week.