Definition of Excellency noun from the Oxford Advanced Learner's Dictionary

 

Excellency

 noun
noun
BrE BrE//ˈeksələnsi//
 
; NAmE NAmE//ˈeksələnsi//
 
His/Her/Your Excellency(pl. Excellencies)
 
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a title used when talking to or about somebody who has a very important official position, especially an ambassador Good evening, your Excellency. their Excellencies the French and Spanish Ambassadors
See the Oxford Advanced American Dictionary entry: Excellency