A more thorough explanation:

Definition: Oyez (pronounced oh-yes or oh-yez or oh-yay) is a Law French term that means "hear ye." It is usually used in court by the public crier to call the courtroom to order when a session begins or when a proclamation is about to be made.

Example: "Oyez, oyez, oyez! All persons having business before the Honorable Judge Smith, come forward and you shall be heard."

This example illustrates how the term "oyez" is used by a public crier to get the attention of everyone in the courtroom and to announce the start of a court session.