Definition of -ian in English:

-ian

suffix

Forming adjectives and nouns such as antediluvian and Bostonian. Compare with -an.

Origin

from French -ien or Latin -ianus.

More definitions of -ian

Definition of -ian in:

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Word of the day grammarian
Pronunciation: grəˈmɛːrɪən
noun
a person who studies and writes about grammar