The term implies aristocracy, reserved for high social ranks, not the average widow. The dowager princess hosted a magnificent ball.
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Retained Prestige
Even after her husband's death, a dowager retains her social prestige and title. The guests respectfully greeted the dowager as they would have addressed her late husband.
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Older, Not Old
Though often used for older women, 'dowager' doesn't necessarily mean she is elderly. The youthful dowager devoted herself to charity work.