Oyer and determiner
- Lit. 'hear and decide'. Oyer is the legal term for the hearing of a case in court. However, the complete phrase is a 'commission of oyer and determiner' for a judge in *eyre to hear cases. Oyer shares its roots with Oyez = Hear me! uttered by the town crier, summoning people to hear his message.
Dictionary of Medieval Terms and Phrases. Christopher Coredon with Ann Williams.