Originally, almoners were common in medieval times, linked to religious duty and charity. The castle's almoner was responsible for aiding the destitute in the lord's domain.
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Modern Usage
Today, the term almoner is rarely used, and roles similar to almoners are often titled differently. Although the role exists, you're more likely to hear 'social worker' than 'hospital almoner' today.
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Cultural Specificity
The term is more recognized in the UK, but even there it's considered somewhat archaic. You might find the term 'almoner' in classic British literature rather than in modern conversation.