the English plural
of any of certain Greek or Latin words
name of any of certain plants
name of any of certain classes, orders, etc.
Webster’s New World College Dictionary, 4th Edition. Copyright © 2010 by
Houghton Mifflin Harcourt. All rights reserved.
Word origin of '-ia'for 1, 2, 7 (& sometimes 4), L -ia & Gr -ia < -i-, thematic vowel + -a, noun suffix of 1st declension; for 3, 5, 6 (& sometimes 4), L -ia & Gr -ia, neut. pl. ending of L nouns in -ium & Gr nouns in -ion; -i-, thematic vowel + -a, suffix