Past participle of 'arise'; means something has come up, appeared, or happened.
From Old English 'arisan' (to rise up), combining 'a-' (up) and 'risen' (to rise). The word has meant 'to occur' or 'to emerge' since the earliest forms of English.
In logic and philosophy, 'arisen' problems are particularly tricky because they weren't predicted—they're emergent, appearing only when complex systems interact. COVID variants 'arose' unpredictably from evolution in real time.
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