Etymology
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justiciary (n.)

"administrator of justice," 1540s; later as an adjective, "pertaining to the law" (1580s), from Medieval Latin justiciarius, from Latin iustitia (see justice (n.)).

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Definitions of justiciary

justiciary (n.)
formerly a high judicial officer;
Synonyms: justiciar
justiciary (n.)
the jurisdiction of a justiciar;
From wordnet.princeton.edu