In a way that happens by chance or without being planned or intended.
From 'accident' (Old French, from Latin 'accidere' meaning 'to happen to' or 'to befall,' from 'ad' + 'cadere' to fall) plus the adverbial suffix '-ally' or '-ily.' The word traces back to the concept of something that 'falls upon' you unexpectedly or unintentionally.
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