Def. 2a A Mormon ranking above a Deacon in the Aaronic priesthood (Merriam-Webster)Def. 3 Someone whose job is to 'work', especially in a school.
NB Words in quotation marks are not the original word used in the definition.
This definition was not available in the Devil's Dictionary so here we go with my own...
Someone whose job is of primary importance in society, but has never been given the social status it deserves both in terms of pay and recognition.