A more thorough explanation:

Definition: Ignoramus (ig-nə-ray-məs) is a Latin term used in the past to indicate that the grand jury did not know or have enough evidence to support a criminal charge. When written on a bill of indictment, it meant that the grand jury rejected the bill. Nowadays, the term "not a true bill" is used instead.

Example: In the past, if a grand jury heard evidence and did not find it convincing enough to support a criminal charge, they would write "ignoramus" on the back of the bill of indictment. This meant that they did not know or have enough evidence to support the charge. The accused person would then be discharged without further answer.

Explanation: The example illustrates how the term "ignoramus" was used in the past to indicate that the grand jury did not find enough evidence to support a criminal charge. It shows how the term was used to protect innocent people from being wrongly accused and punished.