Meaning of -AN in English

-AN

-ian , -an suffix

1.

(in nouns and adjectives) from; typical of :

Bostonian

Brazilian

Shakespearian

Libran

2.

(in nouns) a specialist in :

mathematician

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WORD ORIGIN

from French -ien or Latin -ianus .

Oxford Advanced Learner's English Dictionary.      Оксфордский английский словарь для изучающик язык на продвинутом уровне.