A more thorough explanation:

MAGNA CENTUM

Magna centum is a legal term that means "great hundred". It refers to a number that is equal to six score or 120.

One example of the use of magna centum is in the context of a jury. In some jurisdictions, a grand jury is made up of magna centum citizens, or 120 people.

Another example is in the context of a contract. A contract may specify that payment is due within magna centum days, or 120 days.

The examples illustrate how magna centum is used to refer to a specific number, which is 120. In the context of a grand jury, it means that there are 120 citizens who are responsible for determining whether there is enough evidence to bring a case to trial. In the context of a contract, it means that payment is due within 120 days of the contract being signed.