A countess is part of the nobility, which means she's recognized as a member of the aristocracy by her country. The countess received a warm welcome at the royal event.
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Gender Specific
'Countess' refers specifically to a female; the male equivalent is an 'earl' or 'count'. Upon the earl's death, his wife became the countess.
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High Social Status
The title 'countess' implies high social status and is often associated with wealth and power. The countess hosted a charity gala at her family's mansion.