Eyre (âr), n. [OF. erre journey, march, way, fr. L. iter, itineris, a going, way, fr. the root of ire to go. Cf. Errant, Itinerant, Issue.] (O. Eng. Law) A journey in circuit of certain judges called justices in eyre (or in itinere).
[1913 Webster]

&hand_; They were itinerant judges, who rode the circuit, holding courts in the different counties.
[1913 Webster]