Plural of excellency; titles of respect used for high-ranking officials, or multiple instances of outstanding excellence.
From 'excellency' (variant of 'excellence,' especially as a formal title) + '-ies' (plural). Excellency as a formal title emerged in diplomatic and royal contexts.
'Your Excellency' is how diplomats address ambassadors and governors—'excellencies' is the plural form. It's a beautiful example of how language creates hierarchy through special titles.
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