Source : Webster's Revised Unabridged Dictionary (1913)

-dom \-dom\
   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.

   Note: It is from the same root as doom meaning authority and
         judgment. ?. See {Doom}.