1. the judicial authorities of a country; judges collectively:"the independence of the judiciary"
Word Originlate Middle English (as adjective in the sense ‘judicial’): via French from Latin iudiciarius, from iudicium ‘judgement’. The noun use dates from the early 17th century.
System of courts that interprets and applies the law
The judiciary is the system of courts that adjudicates legal disputes/disagreements and interprets, defends, and applies the law in legal cases. Wikipedia