oyez /ō-'yez, -'yā, -'yes; 'ō-ˌ/ vb imper [Anglo-French oyez! hear ye!, from Old French oiez oyez, imperative plural of oir to hear, from Latin audire]
— used by a court officer (as a bailiff) to gain the attention of people present at the commencement of a judicial proceeding
Merriam-Webster’s Dictionary of Law. Merriam-Webster. 1996.