A body of men selected according to law for the purpose of deciding some controversy. In the old French law they are called inquests or tourbes of ten men.
Juries are either grand juries or petit juries.
The former having been treated of elsewhere, it will only be necessary to consider the latter. A petit jury consists of twelve citizens duly qualified to serve on juries, impanneled and sworn to try one or more issues of facts submitted to them and to give a judgment respecting the same, which is called a verdict. Each one of the citizens so impanneled and sworn is called a juror. The Constitution of the United States also provides that in suits at common law, where the value in controversy shall exceed twenty dollars, the right of trial by jury shall be preserved. There's related stuff in other Library areas, so explore.