A more thorough explanation:

Diei dictio is a Latin term that means "appointing a day." In Roman law, it refers to:

1. A magistrate's notice summoning the accused to appear on a fixed day for trial.
2. The service of a summons.

It can also be written as diei dictitio or diem dicere.

An example of diei dictio would be a magistrate sending a notice to a person accused of a crime, summoning them to appear in court on a specific day for their trial. Another example would be a process server delivering a summons to a person, informing them of a lawsuit and the date they need to appear in court.

These examples illustrate the concept of diei dictio because they both involve the appointment of a specific day for a legal proceeding. The accused or the person being sued is given notice of the day they need to appear in court, which is an essential part of the legal process.