Defeated thoroughly in battle or competition; completely overcome or subdued.
From Old French 'vainquir' and Latin 'vincere' meaning 'to conquer.' The word has been used in English since the 14th century to describe decisive military or personal victories, often with dramatic or heroic implications.
The word 'vanquish' has an almost archaic, storybook quality—you'd say a hero 'vanquished' a dragon, not that they 'defeated' it. The Latin root 'vincere' appears in 'victory,' 'convince,' and even 'province' (a place conquered and held), showing how one ancient concept of conquest shaped dozens of English words.
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