* Formal: "Dr. [Recipient's Name], Honoris Causa" or "Dr. [Recipient's Name], *Honoris Causa* (using italics). This is a very formal and academically precise way to write it.
* Less Formal (but still acceptable): "Dr. [Recipient's Name] (Honoris Causa)" or "[Recipient's Name], awarded an honorary doctorate."
* Including the field of study: If you want to be more specific, you can add the field, like this (but this is often unnecessary unless it's very relevant): "Dr. [Recipient's Name], Honoris Causa, in [Field of Study]," or "Dr. [Recipient's Name] (Honoris Causa, [Field of Study])."
* Never: Use the abbreviation "Hon." While the abbreviation "Dr." for Doctor is generally accepted, "Hon." is not standard and might appear informal or incorrect.
Important Considerations:
* Recipient's Preference: The recipient might have a preferred way of listing the honorific. Check their biography, resume, or website for clues.
* Institutional Guidelines: The university granting the honorary doctorate may have specific stylistic guidelines that should be followed.
* Context: The level of formality needed depends on the context. A formal invitation or diploma would use the most formal style, whereas an informal announcement might use a less formal style.
In short, "Dr. [Recipient's Name], Honoris Causa" is the safest and most formally correct option in most situations.