1) French word used in English 
n. referring to a matter which is capable of being decided by a court. Usually it is combined in such terms as: "justiciable issue," "justiciable cause of action" or "justiciable case."
Issues and claims capable of being properly examined in court.
• (a.) Proper to be examined in a court of justice.
Cases that are appropriate to be tried and settled in a court of law.
Jus·ti'ci·a·ble adjective [ Confer Late Latin justitiabilis , French justiciable .] Proper to be examined in a court of justice. Bailey. 
capable of being settled by law or by the action of a court: a justiciable dispute.