Definition of -ian in English:

-ian

Syllabification: -ian
Pronunciation: /ēən, ən
 
/

suffix

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

Origin

from French -ien or Latin -ianus.

Definition of -ian in:

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Word of the day flagitious
Pronunciation: fləˈdʒɪʃəs
adjective
(of a person or their actions) criminal; villainous