-ia

1.
suffix.
1 forming abstract nouns (mania; utopia), often in Med. (anaemia; pneumonia).
2 Bot. forming names of classes and genera (dahlia; fuchsia).
3 forming names of countries (Australia; India).
Etymology: from or after L & Gk
2.
suffix forming plural nouns or the plural of nouns:
1 from Greek in -ion or Latin in -ium (paraphernalia; regalia; amnia; labia).
2 Zool. the names of groups (Mammalia).