A more thorough explanation:

Senatus decreta (pronounced si-nay-tus di-kree-ta) is a Latin term used in Roman law to refer to the decisions made by the Senate.

For example, when the Senate passed a law to increase taxes, it was recorded as a senatus decreta. Similarly, when the Senate declared war on a neighboring country, it was also recorded as a senatus decreta.

These examples illustrate how the term is used to refer to the decisions made by the Senate. Any decision made by the Senate was considered to be a senatus decreta, and it was recorded for future reference.