from The American Heritage® Dictionary of the English Language, 4th Edition
- suffix Disease; pathological or abnormal condition: anoxia.
- suffix Territory; country: Australia.
- suffix Things derived from, relating to, or belonging to: personalia.
from Wiktionary, Creative Commons Attribution/Share-Alike License
- suffix Used in forming names of countries, diseases, flowers, and rarely collections of things (such as militaria, deletia).
- suffix Used in forming plurals of nouns in -ium and -ion.
New Latin, from Latin -ia and Greek -iā, n. suff.
Latin, neuter pl. of -ius, Greek, neuter pl. of -ios, n. and adj. suffixes.(American Heritage® Dictionary of the English Language, Fourth Edition)
From Latin -ia and Ancient Greek -ία, -εια (-ia), which form abstract nouns of feminine gender. (Wiktionary)
From the endings of corresponding Latin and Ancient Greek plural nouns. (Wiktionary)