A person native to or resident of Alabama, or an adjective describing something related to Alabama.
From Alabama plus the variant suffix -ian, which is a more formal or emphatic form of -an for creating demonyms and place-related adjectives.
Whether you say 'Alabaman' or 'Alabamian,' you're participating in a centuries-old debate about how to form demonyms—English hasn't settled on consistent rules, so different places use different endings, and sometimes both versions coexist in the same region.
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