Definitions:

1. A formal tittle of honor or respect, used when addressing or referring to high-ranking officials such as ambassadors, governors, or bishops. NOUN
   • His Excellency the Ambassador will attend the ceremony.
2. A tittle used to address dignitaries, usually preceeded by 'Your', 'His', or 'Her'. NOUN
   • "Your Excellency".
3. An outstanding feature, or something in which something or someone excels. NOUN
   • The use of herbs is one of the excellencies of French cuisine.
4. The quality of being excellent or outstanding. NOUN
   • The excellency of her performance was praised by all.

Synonyms:

• brilliance.
• distinction
• excellence
• merit
• superiority
• your grace
• your honor