A more thorough explanation:

Diarium is a term from Roman law that refers to a daily allowance of food or pay. It was given to soldiers or workers to cover their daily needs. The plural form of diarium is diaria.

• A Roman soldier was given a diarium of food and pay to cover his daily needs while on duty.
• A construction worker in ancient Rome was given a diarium of food and pay to cover his daily needs while building a structure.

These examples illustrate how diarium was used in ancient Rome to provide a daily allowance of food or pay to soldiers and workers. It was an important part of the Roman legal system and helped ensure that people had their basic needs met while working or serving in the military.