"excellency" in the noun sense
1. Excellency
a title used to address dignitaries (such as ambassadors or governors usually preceded by `Your' or `His' or `Her'
"Your Excellency"
2. excellence, excellency
an outstanding feature something in which something or someone excels
"a center of manufacturing excellence"
"the use of herbs is one of the excellencies of French cuisine"
Source: WordNet® (An amazing lexical database of English)
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