What it the etymology of the word sabbatical?

The word sabbatical was derived from the Latin word sabbaticus and from the Greek word sabbatikos. 

It  was used in the Mosaic law to  relate to the seventh year in which land was to remain  untilled  and all debtors and slaves released from debt and slave status respectively. The Mosaic law came into being 430 years after the Jews first went to sojourn as community in Egypt.

This word is also a noun which relates to a year's absence granted to researchers and university  professors from around 1934 but was first recorded as such in 1886 at Havard University having been attested at the university in 1880.

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