a suffix forming nouns which refer to domain (kingdom), collection of persons (officialdom), rank or station (earldom), or general condition (freedom).
Origin of -dom
Middle English; Old English -dōm; cognate with Old Norse -dōmr, German -tum; see doom
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019
British Dictionary definitions for -dom
suffix forming nouns
state or conditionfreedom; martyrdom
rank or officeearldom
a collection of personsofficialdom
Word Origin for -dom
Old English -dōm
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012
Word Origin and History for -dom
abstract suffix of state, from Old English dom "statute, judgment" (see doom (n.)). Already active as a suffix in Old English (e.g. freodom, wisdom); from stem *do- "do" + *-moz abstract suffix. Cf. cognate German -tum, Old High German tuom.
Online Etymology Dictionary, © 2010 Douglas Harper