a noun suffix having restricted application in various fields, as in names of diseases (malaria; anemia), place names (Italia; Romania), names of Roman feasts (Lupercalia), Latin or Latinizing plurals (Amphibia; insignia; Reptilia), and in other loanwords from Latin (militia).
Origin of -ia
< New Latin, Latin, Greek, equivalent to -i- (formative or connective) or -ī- (Greek -ei-) + -a, feminine singular or neuter plural noun or adj. ending
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2020
British Dictionary definitions for -ia
suffix forming nouns
occurring in place namesAlbania; Columbia
occurring in names of diseases and pathological disorderspneumonia; aphasia
occurring in words denoting condition or qualityutopia
occurring in names of botanical generaacacia; poinsettia
occurring in names of zoological classesReptilia
occurring in collective nouns borrowed from Latinmarginalia; memorabilia; regalia
Word Origin for -ia
(for senses 1–4) New Latin, from Latin and Greek, suffix of feminine nouns; (for senses 5–6) from Latin, neuter plural suffix
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
Medical definitions for -ia
Disease; pathological or abnormal condition:anoxia.
The American Heritage® Stedman's Medical Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.