Definition of oyer
1 : a criminal trial held under a commission of oyer and terminer
2a : the hearing of a document read in court; specifically : the hearing of a deed or other instrument read in court by petition of a party to a suit b : a copy of the instrument given rather than read to the petitioning party
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Origin and Etymology of oyer
Middle English, from Anglo-French, from Old French oir to hear, from Latin audire — more at audible
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