Ia

1. forming nouns adopted unchanged from Latin or Greek (such as mania, militia ), and modern Latin terms (such as utopia ).
2. forming names of states and disorders.

   anaemia

   diphtheria

3. forming names of countries.

   India

representing Latin or Greek endings.

1. forming noun plurals from Greek neuter nouns ending in -ion or from those in Latin ending in -ium or -e.

   paraphernalia

   regalia

2. forming noun plurals in the names of classes.

   Reptilia

abbreviation, symbol

Iowa (in official postal use).