Толковый словарь английского языка Oxford English Reference - dom

n. 1 a title prefixed to the names of some Roman Catholic dignitaries, and Benedictine and Carthusian monks. 2 the Portuguese equivalent of Don (see DON(1)). Etymology: L dominus master: sense 2 through Port. DOM suffix forming nouns denoting: 1 state or condition (freedom). 2 rank or status (earldom). 3 domain (kingdom). 4 a class of people (or the attitudes etc. associated with them) regarded collectively (officialdom). Etymology: OE -dom, orig. = DOOM