1) a keeping sabbath
2) the blessed rest from toils and troubles looked for in the age to come by the true worshippers of God and true Christians
Part of Speech: noun masculine
Citing in TDNT: 7:34, 989
From a derivative of G4521; a "sabbatism", that is, (figuratively) the repose of Christianity (as a type of heaven): - rest.
These two sites give similar information, with the definition from several dictionaries and statistics on the use of the word.
Perseus Digital Library
University of Chicago's Logion lexicon
Thayer's dictionary plus other information.
From this site's dictionary (in Italian)
Click on the first column to search for that word as a form of the root σαββατισμός; click on the second column to search for that grammatical form of the root σαββατισμός; click on the third column to search for that word and grammatical form; click on the total to search for the root σαββατισμός.