What is the common term for an ordinary trial jury?

The correct term for an ordinary trial jury is the petit jury. This jury is responsible for hearing the evidence presented during a trial and delivering a verdict based on that evidence. In criminal cases, a petit jury determines whether the defendant is guilty or not guilty, while in civil cases, it decides on liability and damages. The functions of a petit jury are fundamental to the judicial process, as they represent the community’s voice in trials and are composed of a cross-section of citizens.

While the other terms may relate to jury duties, they do not refer specifically to the ordinary trial jury. A grand jury, for example, is used to determine whether there is enough evidence to charge someone with a crime, serving a different purpose than that of a petit jury. The terms deliberative jury and common jury are not standard terminology recognized in the legal system for describing trial juries. Thus, the term "petit jury" accurately and specifically identifies the standard jury involved in trials.