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English word sudden comes from Vulgar Latin subitanus.

Sudden etymology ?

Sudden detailed word origin explanation

Dictionary entryLanguageDefinition
subitanus Vulgar Latin (la-vul)
subdain Old French (842-ca. 1400) (fro)
sodein Anglo-Norman (xno)
sodain Middle English (1100-1500) (enm)
sudden English (eng) (poetic) Suddenly. (obsolete) Hastily prepared or employed; quick; rapid.. (obsolete) Hasty; violent; rash; precipitate.. Happening quickly and with little or no warning. (obsolete) An unexpected occurrence; a surprise.