die Exzellenz
Excellency
A formal form of address for high-ranking figures such as ambassadors, ministers, or bishops.
Eure Exzellenz, ich möchte Ihnen für Ihre Unterstützung danken.
Your Excellency, I would like to thank you for your support.

excellence / Excellency
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Excellency
A formal form of address for high-ranking figures such as ambassadors, ministers, or bishops.
Eure Exzellenz, ich möchte Ihnen für Ihre Unterstützung danken.
Your Excellency, I would like to thank you for your support.

The word ends in '-enz', which is typical of abstract nouns that often come from Latin. This ending denotes a quality or state, similar to words like 'Intelligenz' (intelligence) or 'Kompetenz' (competence).
Die Exzellenz seiner Arbeit wurde von allen anerkannt.
The excellence of his work was recognized by everyone.
As a form of address, 'Exzellenz' (Excellency) is used with a possessive pronoun such as 'Eure' (Your) or 'Seine/Ihre' (His/Her). It is addressed directly to the person and treated like a name.
Seine Exzellenz, der Botschafter, wird in Kürze eintreffen.
His Excellency, the ambassador, will arrive shortly.
The form of address 'Exzellenz' (Excellency) is very formal and is used only for certain high-ranking people in diplomatic or church service. It does not occur in normal everyday life.
Der Priester wandte sich an den Bischof: „Exzellenz, darf ich Ihnen eine Frage stellen?“
The priest turned to the bishop: "Your Excellency, may I ask you a question?"
In the meaning 'herausragende Qualität' (outstanding quality), the word is often used in fixed expressions. Typical phrases are 'nach Exzellenz streben' (to strive for excellence), 'Exzellenz beweisen' (to demonstrate excellence), or 'ein Beispiel für Exzellenz sein' (to be an example of excellence).
Das Institut ist bekannt für seine Exzellenz in der medizinischen Forschung.
The institute is known for its excellence in medical research.
The meaning 'herausragende Qualität' (outstanding quality) is used above all in formal contexts such as academia, business, or art to describe an exceptionally high level.
Die Exzellenzinitiative fördert Spitzenforschung an deutschen Universitäten.
The Excellence Initiative promotes cutting-edge research at German universities.
majesty
'Majestät' and 'Exzellenz' can both be very formal forms of address for high-ranking people. That is why learners can easily confuse them. 'Majestät' is used for monarchs, that is, for a king or queen. 'Exzellenz' is used for certain high-ranking officials, for example an ambassador, minister, or bishop. The abstract meanings are also different: 'Majestät' means a sublime, dignified effect, while 'Exzellenz' means special quality or outstanding achievement.

Der Botschafter wurde im Brief mit „Eure Exzellenz“ angesprochen.
In the letter, the ambassador was addressed as "Your Excellency."
Nach der Rede dankte die Königin ihrer Majestät dem Publikum.
After the speech, Her Majesty the Queen thanked the audience.