The Code of Maimonides (Mishneh Torah) Book 8, The Book of Temple Service

This translation of the Eighth Book of the Code of Maimonides describes the architectural form of King Solomon’s Temple and the sacrificial worship conducted by the ancient priesthood.  The temple service and priestly caste treated are those abandoned by the sectarians of the Dead Sea Scrolls.  Among the translation’s features of general interest are the uncovering of likely Hebraic sources for the vestments of the Roman Catholic clergy and the ritual of the Mass, and its revelation of the attachment of the Jewish people, through its rabbinic law, to ancient religious practices rendered obsolete by the vicissitudes of history.The translator, Mendell Lewittes, Rabbi of Young Israel of Montreal (Canada), has also provided an introduction. Edited by the late Julian Obermann. Yale Judaica Series, Volume XII. 

The subject matter of the book makes it apparent that Maimonides employed the word 'abodah' in the same sense it is generally used in the Mishnah, namely, religious service.