from The American Heritage® Dictionary of the English Language, 4th Edition
- suffix State; condition: stardom.
- suffix Domain; position; rank: dukedom.
- suffix Those that collectively have a specified position, office, or character: officialdom.
from Wiktionary, Creative Commons Attribution/Share-Alike License
- suffix Forming nouns denoting the condition or state of the suffixed word.
from the GNU version of the Collaborative International Dictionary of English
- Jurisdiction or property and jurisdiction, dominion, as in kingdom earldom.
- State, condition, or quality of being, as in wisdom, freedom.
Middle English, from Old English -dōm; see dhē- in Indo-European roots.(American Heritage® Dictionary of the English Language, Fourth Edition)
From Middle English -dom, from Old English -dōm ("-dom: state, condition, power, dominion, authority, property, right, office, quality", suffix), from Proto-Germanic *-dōmaz (“-dom”). Cognate with Scots -dom ("-dom"), West Frisian -dom ("-dom"), Dutch -dom ("-dom"), German -tum ("-dom"), Swedish -dom ("-dom"), Icelandic -dómur ("-dom"). Same as Old English dōm ("doom, judgment, sentence, condemnation, ordeal, judicial sentence, decree, ordinance, law, custom; justice, equity; direction, ruling, governing, command; might, power, dominion, supremacy, majesty, glory, magnificence, splendor, reputation, honor, praise, dignity, authority; state, condition"). More at doom. (Wiktionary)