Webster's Revised Unabridged Dictionary · 1913

-dom

-dom ({not transcribed})

It is from the same root as doom meaning authority and judgment. {not transcribed}. See Doom.

A suffix denoting
(a)
Jurisdiction or property and jurisdiction, dominion, as in kingdom earldom.
(b)
State, condition, or quality of being, as in wisdom, freedom.

Dom (dom) , noun

[Portuguese See Don.]

1.
A title anciently given to the pope, and later to other church dignitaries and to some monastic orders. See Don, and Dan.
2.
In Portugal and Brazil, the title given to a member of the higher classes.