I. -an / ə n/ AmE ( also -ean , -ian ) suffix
[ Language: Old French ; Origin: -en , from Latin -anus ]
1 . [in adjectives and nouns] someone or something of, from, or connected with a particular thing, place, or person:
suburban
Jamesian
2 . [in nouns] someone skilled in or studying a particular subject:
a historian (=someone who studies history)
II. -ian /iən/ BrE AmE suffix [in adjectives and nouns]
another form of the suffix ↑ -an :
Dickensian characters (=like those in Dickens’ books)
a librarian (=someone who works in a library)