Definition of -an in English:

-an

Syllabification: -an
(also -ean or -ian)

suffix

1Forming adjectives and nouns, especially from:
1.1Names of places: Ohioan Russian
1.2Names of systems: Anglican Presbyterian
1.3Names of zoological classes or orders: crustacean
1.4Names of founders or leaders when referring to them as sources: Chomskyan Lutheran
2 Chemistry Forming names of organic compounds, chiefly polysaccharides: dextran

Origin

based on Latin -(i)anus, -aeus, adjectival endings.

Definition of -an in:

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Word of the day ween
Pronunciation: wiːn
verb
be of the opinion; think or suppose