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.

Definition of -ian in:

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Word of the day dinkum
Pronunciation: ˈdɪŋkəm
adjective
(of an article or person) genuine, honest, true